Get her to log on and we can ask her.
Seriously, for gawdsake ... ask her. But do understand that affair WAS cheating. The fact that it was with a woman is not relevant. It still WAS cheating.
Asking others here ultimately won't help you with your marital problems. Only her opinion and your's is what matters here.
If you both want to solve this problem...go to couple's therapy..or find something or some way to get to the root of the problem..not the surface. She's not satisified sexually or that affair never would have happened.