I had a situation like that. My ex broke my heart so badly and then out of the blue, about two months after he called it off he rang me desperate to get back with me but out of my own principal (over the reason he broke up with me & how much he hurt me) I said no and left it at that. I knew he would just do it again.
That's just my experience but I don't know the reason why you broke up so I wouldn't be able to give you a comprehensive answer to your question but just share what I have experienced with you.
All I can say is you're only young and you should go out and have a good time, enjoy yourself with your friends and meet other guys. I still had feelings for my ex at the time he asked me back but thinking of how much it would hurt again and how stupid I would feel if history repeated itself I just said no.
Sit down and have a long think. Do you really want to be hurt again?
What did he do to break your heart? How long ago did that happen? What has he been doing since then? What is he saying now? Please provide more details if you can.
He used me for sex. its been two months. he has been trying to get back together with me after a month. he is saying that he is sorry for braking up with me and that he still has strong feelings for me and to please give him another chance. - 7 months ago
Answerer
My suspicion is that he probably just wants to use you for sex again. It's possible that he is genuinely sorry, and wants a real, long-term relationship, but probably not. If I were you, the only way I'd give this guy another chance would be explicit terms that there will be no sex (and I mean ZERO) for at least a few months, and maybe longer, and that it will be entirely your call when or if you two have sex again. If he loves you, he should be willing to do this. If not, good riddance! - 7 months ago