Oh man, slap yourself for being so AFC. Just slap yourself. I don't mean that as an insult, it's just step 1 to recovery.
Firstly, when a girl pulls an excuse like she was raped when she was younger (not saying I don't believe her, and I am sure that was a very traumatic experience and I feel bad for anyone who was raped) as a reason for "weird" sex, it's because she was not comfortable. I know from experience - a girl I knew would pull the same excuse on me, until I made her very comfortable, and aroused, and then it was a nonissue. If you made her very comfortable, and aroused, it wouldn't be weird. You also need to know what you're doing during sex. I can't advocate sex outside of marriage, but, you know what to do with that advice - learn to make a girl very comfortable and arouse her a lot before doing anything, and there are books on this and even how to perform.
Secondly, when a girl offers to be friends, she does not actually want to be your friend. Few ex-couples are like Jerry and Elaine from Seinfeld, especially under 30. You need to pull yourself up by your own bootstraps my friend, and stop setting aside times to talk to her. You're torturing yourself for something you want emotionally, but logically you should not. It's your FIRST love, and you feel a deep connection, and such ties are hard to sever (and sex really contributes to this, this is why I just don't advocate sex outside of true, tested commitment, but I know many others on here would disagree).
It's your first girl and you are bound to make mistakes so forgive yourself, but I would say don't try and fix it. Take a couple of days and think things over.
Figure this out:
#1: What's your main goal in life, or biggest goal now? It cannot have anything to do with girls, or you're doomed to failure.
#2: Open up a Word Doc or other word processor and write down 10 things you can do to improve yourself. They may include joining a gym, taking a dance class especially if you can't dance, joining a mixed martial arts program, getting a tattoo, going to bed on time, learning to cook, updating your wardrobe, finding the right haircut, paying closer attention to your religious beliefs, etc.
#3: When you get 1 and 2 out of the way, go meet other women by enlarging your social circle and doing approaches.
This should really help your one-itis. Listen to some upbeat music too man. I tell everybody with these problems my story: I was engaged for almost 3 years, and she flaked and said she wasn't sure she ever wanted to get married. You can imagine how hard that break-up was on me. But I pulled myself together doing these things and dating some new girls and quickly forgot about her. Recently I found out she slept over some other guys house, and she was dating tons of other guys - it didn't phase me. I'm just glad I am not the one trying to keep a slut loyal.