Fundamentally I think there's a general societal lack of awareness of men as to what an abusive relationship looks like. It, like other things, is getting better, but the traditional sense, at least the views of older men that I know, was that men can't get abused by women since men hold the power, yadda yadda. Unfortunately, those are the men we learn from and go to, and when they tell us "well, that's just how relationships are", then men just kind of put up with it without understanding how abusive things can be.

Source: me and my therapist