No wait, it can't be that we (men) are stupid to the point of wanting to get back with an ex that says "oh I'm in love with another guy", like, if she said something closer to "I don't think we would work together", it would make sense.
But who knows as far as I know atm the MC is a fucking dumbass.
Or it could be my lack of love, affection and in general socialization with people that makes me think that trying to get back with an ex that didn't have a single drop of regret on her face when she said "let's break up", he should have at least seen her face right? And I think that trying to get back with an ex that broke up with them is kinda dumb for extroverts as well but ok.
tl;dr fucking dumbass MC at least accept that you were dumped by a bitch.