you dont say if you regret what happened.
if you do, try to get a letter to him or send him a txt saying, what happened between you was a mistake and you would like to put things behind you and move on while staying friends.
If you dont regret what happened you have to consider wether or not you are happy in you're marriage. I'd stop calling him and see where it goes from there. if he contacts you you can both decide where to go from there. If not, at least you know where you stand.
Good luck, hope this helps 