There is a reason you guys broke up---keep that in mind.

He is now cheating on his current gf to be with you. What makes you think he wouldn't do that to you if you two got back together?

If you don't really want to be with him--which you said-- then don't!

Sad fact is most couples who can't get a long on a day to day basis still have awesome sex! But, when other people are involved, its best not to go there.

Cut things off with him, before something worse happens.

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Appreciate the good times and learn from the bad times....