She dumped you? Huh.

On second glance that does change the situation, but my advice stays the same. I think you’re unreasonably jealous/possessive, and I think you should not be with this girl. Her crying over her own sleeping around now strikes me as manipulative. So she can put you down and pick you back up how she likes?

Would I be hurt if somebody dumped me and acted mean? Yes. Would I be hurt if they partied and hooked up with other people? No. My current partner hooks up with other people sometimes. It’s cool, we’re open.