Please give me some tips on how to get your ex boyfriend back?

I miss my ex boyfriend. What can I do to get him back?

I am 20 years old, and my boyfriend broke up with me about 6 weeks ago. We've dated for 9 months. Um, he broke up with me because he said I was too clingy and he didn't have feelings to me any...

more. I couldn't believe this because he said he loved me three days before we broke up.

I did all sorts of crazy things to get him back by the way. I didn't beg much this time! (only called him twice.. And stopped). I tried to talk to him with some excuses that my computer got crashed. But two of my friends got involved into the situation accidently ( one of my friends asked him if he wanted to get back with me, which sounds like I asked my friend to ask my ex, without my permission and something else). Later I had a chance to see him again and told him that I didn't want to go back to him just to make sure he doesn't think I miss him no more. two weeks later, I happened to confront him because I was talking to my friend and he happened to be there, and I acted like I was trying to make him jealous( my friend told me it was abvious!) and acted all happy.. I expected my ex 'd hate me then, but he talked to me on the messenger twice after that happened. Not about asking how I've been doing, but about the stuff I put on today's quote in the messenger.(for example, I wrote something in japanese on today's quote and he corrected my grammar and etc) I tried to maintain the conversations very short. Um, but he didn't talk to me after that.. I am wondering if he's poking on me like hey, won't you talk to me now?? if he's missing me... Or he was just trying to be nice or friend with me.. I mean.. I always begged him in the relationship, because I had no experience before and loved him so much so I wanted to forgive him everytime and apologized first. This is my first time actually acting strange like this...

This is my situation so far, can anyone give me advice on how to get him back?
Ah, I am currently having a summer vacation, I am back to school in two weeks.. And I haven't got any call from him yet.. What can I do during the vacation and after I get back to school? please don't say move on.. At least I can't hear it now. Too hurt...