BTGuy,
I’m sorry you’re hurting. Dating is not easy. Let me tread cautiously and I hope not to offend you, but I really want to give you chizuk. I assume from your name you’re a baal teshuva, secular society (which also permeates frum society as well sometimes) indoctrinates us with a notion of romantic love [argue over who loves each other more]. In my opinion and from experience this merely infatuation and physical desire that often blinds us to real problems. Parents sometimes can see these. Or her parents just didn’t like you for whatever reason, clearly they’re wrong, and I hate to say there are biases against baalie teshuva, often unfounded. And I can guarantee you do not want inlaws that dislike you.
You will get through this, use it as a motivator in tefillah and bitachon.
I would suggest, although you may not want to, for your well being it might be best to break off contact, and that means not speaking through friends or being places where you could bump into each other. It will be must easier to move on the less you think about her.
Again I am sorry for your pain, but know gam zu ltova, and I really hope I didn’t offend you with my unsolicited advice, but I’ve been there.