<human>: I (30f) have been dating a guy for 2 months. He is in his late 20s. He is a man's man: loves sports, beer,  and fantasy football. He grew up in a single parent household; his dad wasn't in the picture. Two days ago I found out that he occasionally responds to m4m posts on craigslist and has even posted an ad himself. He says that he a couple of years ago he got a handjob from a guy he met on CL. He said there was no kissing. The guy jerked my bf off and my bf left immediately after. My bf did have a girlfriend at the time but she didn't know about the CL thing. He was responding to ads in October (we had been dating for 3 weeks) but supposedly didn't meet up with anyone. 

I have suggested that he seek counseling only because he is ashamed, almost tortured over this behavior. He says he's not gay or bi and wants to stop going on CL. He is nervous about going to a therapist though because he doesn't know what to expect.

I told him that if he's bi, I would support him and we could develop a relationship we're both happy with. He doesn't want that. He says he wants monogamy. I know what he did was cheating but that's not the purpose of my post. 

My questions:

What is the psychology/reasoning behind getting the handjob if he isn't sexually attracted to men (at least he says he isn't)?

Has anyone been to therapy for a similar reason? What are the sessions like?

Can you condense the text into a few key points?
<bot>: bf of 2 months responds to m4m posts, says he's not gay,  but wants to stop.