Is it ok being the other woman given the situation?

I met a guy on a night out who ended up opening up about his wife of 12 years having an affair. He stayed with her for the kids and he thinks it’s still happening as she still works with the guy. They’re on again off again. I had a lot of fun with him but never kissed him knowing he wasn’t single. He wants to hang out with me again and we had a lot of fun together but I’m conflicted. Usually I’d be like straight up no because I could never see myself going on a date with a married guy but given the situation what would you do?
Is it ok being the other woman given the situation?
Post Opinion