Guys and girls, why can’t my girlfriend choose between me and a guy she met?

I’ve been dating my girlfriend for two years now (long distance) and a couple of months ago we broke up for two weeks. Then she started dating this new guy who’s kinda a dick to her makes her feel bad about herself and has cheated on her with many many people, hookers included. And yet, we got back together, she didn’t break up with this guy and now she’s trying to choose who to stay with, because she says she loves us both.

Guys and girls, why can’t my girlfriend choose between me and a guy she met?
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