Eh. That's very dangerous. They could be all kinds of charming and try really hard (they know how) and be a real sweetie but then, it is a hundred times harder to let go and think clearly and make the right choice for her. In the end ... is he sincere? Can she believe him? Does it make it forgivable? Will she be less hurt? Would his apology make up for what he did?If he is begging and pleading and being honest and making efforts to communicate and to understand you and really being prince-fucking-A-charming, then great, there's hope, but if he's just letting this slip into oblivion by letting "water pass under the bridge" I would be hesitant to consider this a one time "Oopsy, I slipped on a banana peel, and I fell down, and my dick ended up inside her, how did that happen?"
Haha, slipped on a banana.