Do you ever feel guilty having sex with a married?

I know it’s the married man’s choice to cheat on his wife or now husband, but how do you feel about it?
There is a married man that I occasionally blow. He goes to my gym and we meet up in the parking lot and I blow him in his minivan. I love his freshly washed cock. But I love even more the fact that he yells Jesus, as he cums in my mouth. He tells me it hurts so good and it leaves him drained, so much so that he has to sit in his car a few minutes before he drives off to work. His pleasure keeps me going, but I guess because we don’t do it so often, I am accepting. Not sure if I am coming across well, or just being old fashioned?