The greatest cowards, insecure people, and those terrified and hurt can act the most braggish and brattish, so his behaviour is nothing to really go by. Just try to avoid further confrontations and if you feel string enough try to do something unexpectedly nice for him, and ignore your idiot friends who clearly base other people worth on similar pseudo masculine bull, you don't need to behave a certain way to save face, there is no face to save.