<human>: Summarize the given text in a few sentences.

I[25] recently went through a break-up with a girl[19] I had been dating for a year and a half. I've dated other girls for longer, but none ever meant so much to me as this one. She broke it off because she said I was too much like her father, as in controlling. She got fed up with me asking where she was if I hadn't heard from her or calling to see how she was while she was hanging out with friends. Basically, she broke up with me(at least as I see it) for caring. She has a lot of issues on her own though, mostly relating to her father.

Anyway, this has left me emotionally crushed. I've never cried from a break-up before, but I've been crying and throwing up for a few days now. I invested more of myself than I ever have. How am I possibly supposed to move on from this? Everyone keeps telling me this is a good thing, and that I'll find someone better. I wanted to marry this girl.

Has anyone else ever gone through a break-up like this? Does it actually get better? Right now I feel like I don't have anything to offer the next person. If I gave everything I had to this girl and she does this, how am I supposed to look forward to the next? A friend told me it was an experience to learn from, but I can't see what I learned. Don't give them my all? Remain closed up and detached? How am I supposed to put myself out there again? Not to mention that I'm starting a new job that is basically all guys; I don't even know where to try and meet some one. I've always dated co-workers or friends of friends.
<bot>: How do I emotionally put myself out there again for the next girl to come along after being so hurt by this one?