Don't think that you can find a guy that is a total jerk and he will change his evil ways just to be with you. Why would he change his evil ways if it is working for him, he got the girl. He's just gonna try to make you more tolerant of his crap.
I see this happen all the time and it's just crazy. If he's an obnoxious jerk when you meet him, he will be an obnoxious jerk when you leave or he leaves. Tigers don't change their stripes.
It may seem exciting because he is loud, and in your face and commands attention like fireworks. Don't be fooled, fireworks burn out quickly and leave with you burns and ashes.