You have this really odd, skewed perception of love that is not only toxic to those you date, but it's toxic to you too. I have no idea where you got it, but love doesn't work in the ways you think it does. You're coming off as someone who's really selfish, not someone who truly cares about her.
Quote: Windumup
except he was her ex and then me and her became a couple. Also how is it selfish to want her to be truly happy? I don't want her to have her heart broken again by the same guy as I care for her feelings.
If she wants to go back to him, then she's not truly happy with you. You guys have been together for what, a week? You haven't even been on an actual date yet, don't expect this relationship to be full devotion and actual love this early on. Its extremely unrealistic. If she want's to go back to him, let her.
Quote: Windumup
Because they have an on and off relationship, I want her to be happy and not torn a part by someone who isn't good for her
That's your opinion, not fact, so stop treating it like one. You can't just control someone like that, if she wants to go to someone else, that's her say, not yours. Even if she cheats on you, that was her choice, one that you can't control.
Quote: Windumup
But wouldn't it be better if nobody got hurt? And if we do get into a polymorous relationship and then broke up with him again, she will still have someone else.
That's not how polyamory works. Modern polyamory is more "multiple people love each other equally", not "I have two significant others, but I love this one more, and if I break up with them, I have this backup". Not even how polygamy works, let alone polyamory. Again, I don't know where you get these twisted notions of relationships.
Quote: Windumup
Denial? She literally cried, she doesn't want to break up with me
Yeah? My ex had sex with someone else, and cried while breaking up with me too. It doesn't mean anything.
Everyone else who's posted in this thread is right. You just need to move on. You weren't even together for that long, so it's not like she's breaking up over you after years of dating. Look at it this way, its better that she did it now while you guys are young than if you guys had taken it further and had gotten engaged or something. If she's been off and on with this guy for a while, there's obviously something that keeps her coming back. From my perspective, it just sounds like all these other people she dates are rebounds, which isn't good for either party. If this is what she wants, let her go. If you truly care about how she feels, then let her.