My husband put me through a lot when we were dating, no need to go into details, but suffice it to say, if he cheats he knows there is no way no how I would ever forgive him, or try to "work through it". I would try to make the divorce as amicable as possible for the sake of my son, but I know that having my son live in the kind of atmosphere that would be in our home if I didn't kick my husband out would be far more disastrous to him than a divorce.
Trust is a fragile thing, and rebuilding it can be almost impossible (this is the voice of experience speaking). I don't judge others who do, in many ways I admire them, but for me, there is no return from that journey, one time or long term doesn't matter.
My opinion only,
Happyout