The 3 Month Rule is a dating concept that suggests a 90-day trial period where a couple "tests out" a relationship to see if theyre compatible. During this period, couples learn about each others likes, dislikes, and possible red flags. At the end of the 3 months, couples discuss if they want to pursue a long-term relationship. If not, they simply go their separate ways. The rule is spent weighing the pros and cons of the relationship, and it is recommended to use this time to question the character, personality, values, and habits of the potential partner to see if theyd be a good match. The 3-month rule is not the same as the honeymoon phase of a relationship, which typically lasts 6 months to 2 years and doesnt involve an evaluation period like the 3-month dating rule. While the 3-month rule is not scientifically supported, it can help individuals determine if the new person theyre dating is a keeper. TikTokers have also recommended a new dating rule called the 90-day probation period, where people can evaluate potential partners for 90 days before deciding if theyre a good fit.