Has anyone ever been f'ed over by a girl like this?

So as I've said many times, I've never had a gf, hardly hook up and just generally feel unattractive to girls. Well, last Saturday me and a girl became infatuated with each other and were seeing each other. I really liked this girl and I guess I was falling in love. She was really beautiful and funny and I could tell she liked me. Also, all my negative thoughts about how I was unattractive and girls hated me and I was a loser vanished and I was confident for the first time in my life. Then, today, apparently her ex shows up with flowers. She's back with him and she removes me from facebook without telling me and doesn't answer my calls and probably wouldn't have if I hadn't went to her friend to call her. She tells me the score and tells me how there are better girls than her out there and I'm crying probably making myself look even less attractive to her and she's probably secretly loving me be that devoted to her. I know I know, it's important not to get too attached to a girl or else u'll seem needy and unattractive. I guess I did that but is that wrong for loving too much? It's not fair that I get hurt and her xbf who probably treated her like **** gets her back. Life sucks.