I think this is just so new to him,he dos'nt know how to act.Sounds like he has a real mixed bubberling pot of thoughts and emotions.Talk to him,ask him what he wants,how he feels,tell him what you want,if you want to give him another chance ,give it,but don't make a habit of it.
His brother is a complete bitch,i would of made him wear his testicles for earings.As for the humiliating way he spoke to his friends about your sex life,thats just overcompensating,like when a guy starts going out with a girl who is not to popular or considerd cool,he makes it sound like they mean nothing to them,it's another fuck,which is a bloody mean thing to do,to hurt someone just so you appear cool.
If he hurts you again tho,drop the worhless piece of shit.