I quite agree with Polecat above. I've lately been in a similar situation and recognized it at once. All I have to add it that he also seems to have tried to remedy the situation once s/he left, but, now, realizes it's useless -- he efforts to talk it out went badly, as far as he's concerned entirely on his part, and possibly he's even starting to feel that the version of her that he knew and loved is fading away from his sight now, cementing his sensation that there is no point in trying anymore to salvage things.
I quite agree with Polecat above. I've lately been in a similar situation and recognized it at once. All I have to add it that he also seems to have tried to remedy the situation once s/he left, but, now, realizes it's useless -- he efforts to talk it out went badly, as far as he's concerned entirely on his part, and possibly he's even starting to feel that the version of her that he knew and loved is fading away from his sight now, cementing his sensation that there is no point in trying anymore to salvage things.