I have to agree with the advice given. I don't see what you stand to gain by staying with him if he refuses to ever marry you because "his parents won't let him." That's a very poor excuse, and I'd agree with Perna in calling him a boy rather than a man. He's in charge of his life, not his parents.

Have you tried talking to him about this and how this makes you feel? He might not understand that his response isn't enough. Some guys feel that a response is a response, and that isn't quite right (speaking from experience as a guy here). He might feel justified in not responding because he is at the office (again, not really an excuse IMO, but I've seen similar). Even then, I'm not sure I'd feel okay knowing up front that he's never going to propose to you...

If I were you, I would have that talk. If things don't change, cut it off and find someone who's A) In charge of their own life and B) Cares enough to not cause you undue stress and C) cares about your emotions. You deserve more than (what is in my opinion) a dead end of a relationship.

I am sorry you are going through this. I will keep you in my prayers.