It sounds like you've both been through quite a lot. I really admire your courage. I think you have to find out if he's traded one addiction for another, specifically attention from other women. For your own sake, and that of your children you have to find out if he's dedicated to this relationship. What does your gut tell you? If you think it's worth fighting for lay some ground rules, couples councelling etc and fight for your relationship. But if this is too draining on YOU, sometimes the best thing you can do is cut your losses.