<human>: Condense the text into a few key points

I made the mistake of dating my best friend in high school, and over time we grew into very different people, but because of our attachment to each other we didn't want to break up until it became too much for both of us. She ended up cheating on me, which sucked. 

I had decided I was going to be abstinent my first year of college. Just to practice some self discipline, and to work on being friends with women again. That went fairly well, but I'm in my third year. For the past year I've been okay at flirting with girls who I have shown interest in, and have displayed a mutual interest, but that is basically it. 

I have not been able to really open up emotionally, and I have not been able to engage someone physically. I cannot bring myself to do little things like hand holding or arm-over-shoulder stuff, and forget about simply kissing a girl. Every once in a while I meet a girl who is very direct and she will be making all the moves which is nice, but I can't just sit and expect that to happen. 

My two best friends and roommates are both talking about getting married, and I havent had a serious girlfriend since high school. I am absolutely not saying I'm looking for that, in fact I think they are both insane, but you can probably understand that I feel a bit...behind.

 I just want to find some courage within myself and now how to take risks again. I haven't felt in love in a long time, and when I do I want to not fuck it up. I'm sure this is nothing new to this page, but it would still be a big help.
<bot>: How do I relearn to interact with women in a romantic way after a shitty relationship dating my best friend, and three years of being completely single and almost completely abstinent?