I'm not gonna lie, maybe. It's not gonna help if they are sexy and we get along well either. But if they have children, I probably wouldn't let it go too far. I see both sides. Which is why I said maybe.
Nah...I hooked up with a married guy once. I didn't know he was married until we were already doing the deed. He was going at it and I said "Wait...are you married?" "Yeah" "Okay" and we just continued on our merry little way. I regret it tbh, and I think infidelity is one of the worst things ever.
If I ever found my father, my husband/wife or my children cheating I would delete them. No, I wouldn't date a married person unless the divorce was coming or the marriage wasn't true.