I've been in relationships with women in the past who out of nowhere decided they didn't like me anymore even though they might have the day before. It usually involved them "upgrading" from me to a better looking guy and then quickly forgetting about me and not giving a shit about how their decisions affect other people.

Knowing how fickle they are and change their opinions quickly and get bored very easily, how can any sane man consider marrying a woman? I've never had a woman that was a lifelong friend or could stay in a relationship for too long before getting bored. What rational man would think they could actually keep a lifetime commitment and risk losing half of his shit over it?