That makes complete sense, but that's not what's currently
happening in the game. See e.g.
the quotes that started this, where the MC suddenly can't bring
himself to cheat on his girlfriend, despite having done so non-stop for weeks or months. Him being cheated
on doesn't enter into it at all.
I think we agree on what would make sense to happen. You just have some passages in there that contradict what you say here.
It's a fairly minor issue in the grand scheme of things, but it might be good to clean it up in a consistency pass at some point.