@klazaro, you put into words my thoughts. @mommytomytribe you deserve to be respected and if he had the audacity to cheat on you and now is using you for casual sex without ever making anything right, I only see you getting hurt again.
Lol maybe being married puts too much pressure on the relationship. If you two are going to keep hooking up you should set some boundaries before someone gets hurt.
Are you trying to reconcile or just playing?
I think this happens because the familiarity is comforting. You both already know each other's bodies. It could be great. It could also be a mistake.