Yeah, it baffles me too. It's a big cultural thing that is very harmful I think. In books and tv shows where there's a girl that has to choose between two boys, she always choose the new guy she has an intense crush on, instead of the nice guy who has always been there for her and that she also loves? But for what I have read being "in love" is like being on drugs (for what is going on in your brain) so I get why you might not act all that clear-headed.