If that person is trying to work things out with their spouse, hell no. Otherwise, well, I’m doing it. Not totally happy about it, but really like the girl.
I have. If I were single and not specifically looking to get into anything serious right away, I would again. It was never a big deal.
In general, if one party does something to break a contract then the other party is no longer bound. I’m assuming that the cheating activities are ongoing.
If I were single, I doubt I’d date anyone before the divorce papers are filed. After that, fine, assuming things seemed really over. But I have no real experience in this area.