A decision has to be made....?

First of all, I advise you to get as far away from this guy as possible, as quickly as you can. The fact that he is threatening you with violance in order to get his way says a lot about the type of person he is. If you have parents who can give you support and advice, turn to them. Also, if he threatens you again, I;d go to the police. Support groups with people in similar situations is really the only other thing I can suggest.