Everyone cheats the same. He's not looking to get a divorce. When he goes home he's married and when he goes out he's with the girlfriend. It's hard for a woman to find out her husband is having a relationship with her and still be having an affair. They take care of it at home and they take care of it on the way out.
Women usually fool around for emotional support.
She'll be with the person and say here are my problems. Very, very seldom do we find the woman also sleeping with the husband. That's one big sign. It's easier now for women to meet people. Based on people hooking up through computers, we follow women more now.