We have been married for 8 years; 3 kids. He had an affair 5 months ago with a woman. It is over and we are working on our relationship. However, he has been looking at gay adult movies, pictures etc. Now he is responding to gay personal ads for sex. I think he has been with one. But responded to many.

He does not know that I know any of this.

How do I confront him without him feeling ashamed, mortified, etc.? I want to remain friends with him, as I do love him and have kids with him. I don't want to be married anymore. But love him and want to help him.
PLEASE give me advice