How to tackle this?

There was this girl she was not that beautifull but unfortunately i fell in love with her. I dont know if she used me or not but i guess she didn't because i knew her well and she was one of my best friends. Last to last summer she broke up with me without giving a proper reason but i guess it was because of my insecurities towards her and maybe i was a little possessive about her. The only loss i have right now is that i dont have her as one of my best friends. I mean i do have my guys who are like brothers to me but after her i am not able to date anyone. Three rebounds came and i had perfect opportunity with each one of them and i ruined it. I am not in love with her but i am also not able to date anyone else. Also after breakup my behaviour changed i started to joke about my life and stuff just to entertain people but completely lost my repitation through the procedure. I often run out of things when i talk to girls which never happend before. It's pretty fucked up but any opinions what one can do in a situation like this?
How to tackle this?
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