Um.. not a good idea.
I don't know anything about this guy really other than this little paragraph, but he was with someone else. Is he done with that other person or whats the situation with that? Was he with that person during your uninnocent yet casual thing?

Sorry hun, this guy doesn't sound worth it to me.

I dont know if he was with her then, I only found out about her the other day, but yeah, I'm pretty sure he was. Meh, guess I'll keep my distance then.
Thanks anyway
Meg

Meg, If he doesn't want you, let it go.. I would not want to be with someone that even slighly acted like he didn't want to be with me.. YOU ARE WORTH MORE!
Remeber he broke it off..
I'm not sure if you had sex with this guy but if you did and you are with him again on a casual basis and you have sex then.. I would think that is what he wanted from you.. Please stop.. Unless he comes to you and says that he made a big mistake and wants you back. Let it him go.. I know you hurt.. rejects hurts more than the thought of not being with him. But time really does heal.. It really does. Stay busy and DON'T think about him.. and if you do.. think about how he did not want you anymore.. Get mad over that. It will help you get over him.
Good Luck..

Dont do it! In time you will get over it and heal...he won't buy the cow if he can get the milk for free and you know what he doesn't deserve you at this point. Break it off completely and move on and you will find someone a million times better!