Almost half of all civil divorces filed in Singapore during 2025 relied on unreasonable behaviour as the legal ground, accounting for 48.7 per cent of marital breakdowns among non-Muslim couples. This makes it by far the most frequently invoked reason for dissolution of marriage under the Women's Charter. In sharp contrast, adultery—traditionally viewed as the archetypal cause of marital collapse—featured in less than one per cent of civil divorce cases, a finding that appears counterintuitive until one examines the mechanics of Singapore's dual legal system.
The statistics tell a markedly different story for Muslim couples, whose divorces are adjudicated under the Administration of Muslim Law Act. Among this population, infidelity ranks as the second most cited reason for marital breakdown at 18.4 per cent, trailing only personality differences at 21.5 per cent. This dramatic divergence between civil and Muslim divorce statistics has prompted legal experts to caution against drawing conclusions about the prevalence of infidelity across different communities, emphasising instead that the figures reflect fundamentally different legal frameworks and evidentiary requirements rather than behavioural patterns.
The Women's Charter establishes a single overarching legal ground for civil divorce: that the marriage has broken down irretrievably. To demonstrate this breakdown, the law recognises six distinct pathways, three of which rest on assigning fault. Adultery, desertion, and unreasonable behaviour constitute these fault-based avenues. Two additional routes involve separation—either three years with mutual consent or four years without it. A sixth category, divorce by mutual agreement, entered force on 1 July 2024 and has rapidly become the third most common ground after unreasonable behaviour and three-year separation. This legislative flexibility fundamentally shapes how couples structure their divorce applications.
Proving adultery in a civil court presents formidable practical obstacles that deter many from pursuing this ground. Lawyers representing both parties consistently report that establishing infidelity requires robust circumstantial evidence—typically reports from private investigators, photographs, videos, or contemporaneous communications that demonstrate a sexual relationship occurred. This investigative burden translates into substantial legal costs and delays. Many divorcing spouses who experience infidelity as the underlying cause of marital dissolution pragmatically opt instead for unreasonable behaviour, a category sufficiently capacious to encompass the emotional harm inflicted by unfaithfulness without requiring proof of the sexual act itself. This strategic choice transforms what might appear statistically as an infidelity-driven divorce into one attributed to unreasonable conduct.
The conceptual scope of unreasonable behaviour extends far beyond colloquial understandings of bad conduct. The Women's Charter recognises within this category a spectrum of behaviour including domestic violence, sustained verbal abuse, controlling conduct, substance addiction, compulsive gambling, financial mismanagement, parental neglect, and extra-marital affairs. In uncontested divorces, couples need not assemble extensive documentary evidence since neither party disputes the allegations. Where divorce is contested, however, establishing unreasonable behaviour typically requires a documentary record comprising messages, financial statements, police reports documenting violence, medical evaluations, or testimony from witnesses such as neighbours, family members, or marriage counsellors. The evidentiary requirements remain substantially less demanding than for adultery.
The Muslim divorce framework, governed by the Administration of Muslim Law Act and adjudicated in Syariah Courts, operates on fundamentally different principles. Unlike the Women's Charter, AMLA does not enumerate statutory grounds for divorce but instead authorises the Syariah Court to determine proceedings according to the Act itself and applicable principles of Islamic law. When Muslim couples seek divorce, statistics record the reason they cite for the marital breakdown rather than legal facts they must prove to a court. This distinction proves critical: the 18.4 per cent of Muslim divorces attributed to infidelity represents couples' stated reason for separation, not a judicially-proven fact. Consequently, comparative statistics between the two systems conflate two different measurements—legal proof on one hand and reported cause on the other—making direct comparisons potentially misleading.
Legal practitioners emphasise that the prevalence of unreasonable behaviour among civil divorces reflects its utility as a legal tool rather than its frequency as an actual cause of marital breakdown. Unreasonable behaviour offers multiple strategic advantages. It avoids the elaborate evidentiary requirements imposed by adultery cases. It eliminates the temporal constraints attached to separation-based grounds, which require couples to maintain separate residences for three or four years before filing. Unlike mutual consent divorce, which requires both parties' cooperation, unreasonable behaviour can be pursued unilaterally. The category's breadth allows divorcing spouses to encompass the true genesis of their breakdown—whether infidelity, emotional withdrawal, financial stress, or other factors—without rigid categorisation.
The introduction of divorce by mutual agreement in mid-2024 offers a competing pathway that fundamentally reframes the divorce process by eliminating what legal practitioners term the blame game. When both parties mutually consent to dissolution, neither must shoulder responsibility or defend conduct. This no-fault mechanism appeals to couples seeking to minimize acrimony, particularly where children are involved, by removing the necessity for either spouse to demonstrate the other's culpability. Already in 2025, mutual agreement divorce has captured the third-largest share of civil divorces, suggesting couples increasingly prefer this collaborative model to adversarial proceedings rooted in fault assignment. This trend may gradually reshape patterns of divorce ground usage as more divorcing couples become aware of the option.
For Malaysian readers and policymakers, Singapore's experience illuminates tensions inherent in divorce legislation that simultaneously attempts to impose moral judgments through fault-based grounds while accommodating practical realities that render such grounds difficult to prove or enforce. Malaysia's own Islamic Family Law, which governs Muslim divorces, permits talaq divorce available primarily to men, contrasting sharply with Singapore's judicial approach requiring court oversight. Malaysian civil divorces, governed by the Law Reform (Marriage and Divorce) Act 1976, similarly provide fault-based and no-fault pathways, though the balance between these options and their actual usage patterns warrant examination. Singapore's statistical data underscores how legal frameworks shape behaviour far more substantially than moral principles; couples consistently select grounds most easily proven and least costly to pursue.
The stark differential between adultery's theoretical significance as grounds for divorce and its negligible practical prevalence in civil cases demonstrates how procedural requirements can render formally available legal pathways effectively obsolete. Singapore's pattern suggests that as legal systems mature and provide alternative routes to dissolution, fault-based grounds—particularly those requiring onerous proof—progressively recede in actual usage. The emergence of mutual consent divorce as a substantial category within a single year of implementation signals that many divorcing couples prefer collaborative dissolution to adversarial proceedings. This trajectory carries implications for Southeast Asian jurisdictions considering divorce law reform, suggesting that expanded alternative mechanisms may more effectively serve divorcing parties than retaining elaborate fault-based requirements that remain theoretically available but practically inaccessible to many.
