Also Three Month Rule, or relationship, or milestone, or point (you get it).

Describes the time past in a relationship (3 months) in which couples consider if they want such to be long-term, which is to either make their love more serious and official, or decide to reevaluate it all together and even end it. Generally, the first three months of an relationship are the most exiting, and define the first stage of one. 3 months gives each person the time to 'get to know each other' and to measure the other's character and its consistence past the illusions of expectations and ideals.

3 months is purely arbitrary, but is a 'thing' to allow lovers to have a milestone in which they reflect on how things are going, and can be used as an excuse by one to set things further into motion or to end it all together.

In short, love and relationships has no obvious rules, but that makes it difficult, so coming up with some general truths in the midst of it all helps .
Bro 1: Dude.. Everything was going perfect until she brought up this three month mark rule shit, the hell does that even mean?

Friend: Here, look at this definition I just found.
by Dieg-J January 6, 2022
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