The "three-month rule" is a popular dating theory stating that the first 90 days of a relationship represent a "honeymoon phase," after which true compatibility is revealed, infatuation fades, and real personalities emerge. It is often used to determine if a partner is serious or if hidden red flags make the relationship unsustainable long-term. Key Aspects of the Three-Month Rule:The Mask Falls Off: Many believe people can maintain a perfect facade or "mask" for about three months before their true habits and nature appear.End of Infatuation: The intense, dopamine-driven "butterflies" phase tends to fade around this time, allowing for a more realistic assessment of the partner.Evaluation Period: It serves as a trial period to see if the relationship can move from casual to committed.Decision Time: If a partner has not shown100% commitment or if serious incompatibilities appear by this mark, it is often seen as a sign to end the relationship. Origin and Validity:Pop Culture/Social Media: The rule is popularized through TikTok, dating forums, and advice columns rather than scientific research.Context Dependence: Some critics argue the "rule" is arbitrary; knowing someone depends more on intensity and quality of time spent together rather than a fixed date on a calendar.Alternative View: While useful for identifying early red flags, serious incompatibilities can emerge much later, often during the first major argument, which might happen around 6–12 months. InstagramInstagram Ultimately, the rule is meant to protect against investing deeply in someone who is not compatible or serious, acting as a "buffer period".