Leave him alone. You're married and that disqualifies you from interacting with Ex's. I could be wrong but it sounds like you miss him. I hope it isn't true - is something wrong with your marriage? you must have a good reason that isn't being expressed here about why you want to resume contact.

I'm fairly certain he is going to feel weird that a married ex-girlfriend suddenly resumes contact - especially after the relationship closed on a negative note. I would feel odd if a married ex of mine suddenly shows up, especially WHILE SHE IS STILL MARRIED, and want to hang out.

I think we all wonder about the "one that got away", just so long as you don't destroy your life - or his, over idle speculation. I don't agree with some of the members above calling you a whore. I do agree with them that you had better watch your step. Ex's are like dynamite - gingerly handled. Good luck!