Is this typical behavior for an abusive partner after a break up? Why do they do this?

I have a friend who finally got out of an abusive marriage, and when she told her ex husband he got in a rage, destroyed belongings in the house and damaged the wall. He pleaded that he wanted to be with her, but when the divorce was finalized he went up and married another a woman in no time, he was probably seeing this woman while they were still married.

When I broke it off with my ex he was angry at first, then begged me to come back to him, saying he’d change and he’d wait for me “in our future,” then he finds another girlfriend a week after saying he bought me a ring. It doesn’t end there… he continues to try and see me, park next to me, sent me flowers while he is with this girl. Then he denies that he is doing such things (I have a no contact order on him). What in the world goes through these peoples’ minds that they do this? I have been trying to understand such ludicrous behavior. Why can’t he just move on?