I mean, there never should have been a misunderstanding in the first place, tell a fucker why you're leaving when you leave them, it's entirely their fault he has zero love interest in them right now. If either of them told him the proper reason they were leaving him there would be a chance for them in my mind, but this is a romance manga and everything is never wrong and every time someone gets hurt emotionally it never matters in the end and the weakest fucking apology fixes everything for everyone.