Why is he such an ass - break-up?

Ok, I see a lot of issue's with this guy, but the one that bothers me the most is the fact that he hit you. There is nothing that a women can do to deserve to get hit. I will repeat that. THERE IS NOTHING THAT A WOMEN CAN DO THAT DESRVSE TO GET HIT BY A MAN.

Joecollage hit on all the rest of the points of why this guy is a looser. 17 years you have known this guy and this is what you get. Loose this guy as fast as you can. I hope you feel better soon

Forget that, this guy sucks period. Lets go over the list why this guy sucks.
1. If you keep the baby your out on your own. (17 years don't mean anything I guess)
2. If you don't I'll be there for you and help you out (to get you to have an abortion)
You have an abortion, and he says he hates you and says you ruined his life (sounds like he is projecting his guilt on you, even though he used his influence to get you to have an abortion)
3. He hit you.
4. He is leaving you feeling insecure, like you did something to deserve getting hit and treated like crap.

This guy needs to grow up and deal with himself. This whole baby thing has done a lot more to him then he thought it would, and he is taking it out on you. He needs to deal with his issues, leave him before it gets worse. He is a old friend so deal with it as tactfully as you wish, but please make it very clear that what he has done is totally unacceptable and get away from him and move on.

Girl I don't know what to tell you...I'm sorry to hear about all that, knowing a guy for 17 years and suddenly being treated like crap must be painful. Assuming you're not leaving any major details out, maybe that guy simply had enough of you.. I don't know what else to think. I don't think you did anything to deserve this - people don't always get what they deserve (yes it sucks, I know.. :( ), but you should try to talk to him to see what's bothering him. If he's just started this recently, maybe he has something on his mind and he's taking it out on you. Maybe it's temporary. Try talking to him to figure out what changed in the past month. I can only hope for you that it's something temporary. If he keeps this up, especially the hitting , you shouldn't take that from him, just walk away. But if you still like/love him, you should attempt to find out what's wrong before you disappear.. I hope it works out-- why does the title say "break-up"? From your question it sounds like you're still together.