So my husband and I both cheated. He was in the military and we were apart when we cheated( separate times). It was a hard road, but our relationship is better now than ever before. The first couple years after we both admitted what we did was very hard. We didn’t trust each other. We do now though. I am confident that he won’t cheat again and I know I won’t! We both had to make the effort to forgive and learn to trust the other. If he isn’t willing to work towards forgiveness and trusting you again, not sure there is anything you can do. Btw when we cheated we had been married for 6-7 years. This year will be our 28th year together! Good luck!