Happily married SD???

I didn’t think I had any reservations about seeing a married man. I had a m&g with a man who feels safe, similar interests, attractive. I was aware of his martial status prior to meeting and that didn’t bother me… Until he stated that he’s “happily married, life is perfect, sex life is great, cheating is just a “hobby””?

On one hand I’m happy he doesn’t hate his life/wife, on the other I feel gross about it (we do not have an arrangement, nor have we been intimate and no I don’t want to proceed).

Interested in hearing thoughts/stories/opinions if you’ve had a similar experience.

Thanks!