Most Helpful Guy
I'm a guy who would fall into that category and here's how it works for me. I've only exhibited that behavior in one of my relationships and it was a reaction/response to the depth of my feelings for her, the depth of her feelings for me, and being the kind of guy that will burn a city to the ground if it stands between me and my partner (figuratively speaking). Men instinctively use anger and aggression as tools to overcome a threat more than a woman due to our shared experiences throughout human evolution. I'm not the kind of guy who starts fights, I don't have any interest in violent sports, and I have a sense of compassion for the suffering of others that is sometimes overwhelming. However, I will fiercely fight for something I think is worth fighting for, as was my previous relationship. And if I feel that I am being ignored or treated unfairly in that process, the anger is likely to flare (which can be damaging to a relationship). But if I have little to no feelings involved in the girl and our relationship, then you'll find me handling it like a kind and considerate robotic diplomat. The parting is peaceful and on good terms because there is nothing about it that feels like a threat to me in any way.
Most Helpful Girl
I mean it's possible just because ANYTHING is possible but no, generally a guy treats you like crap when he breaks up with you because he thinks you're crap.
Guys aren't complicated, and this isn't a feminist ideal men will tell you the same thing. It's women who make men more complex than they really are lol