Why do most relationships that don't work out only last around 3 months?

A lot of my friends have been in this situation where they have dated girls and after 'three months' they have broken it off. It always seems to be 3 months. What is it about the big 'three months' that makes a lot of relationships fail after this amount of time?Why do most relationships that don't work out only last around 3 months?
My Mother has always told me that infatuation lasts anywhere from 2 - 3 months. By this time, one or both parties is looking for the nearest escape route.





My Mother has always said that if you don't know within the first 6 months is this person is right for you, move on because you're never going to know and you are wasting their time and yours.





It all boils down to this - The person(s) in question has not found THE right one and are continuing to look.

zits