I would like some advice about my relationship with my boyfriend of a year and a half.?

I have been dating my Boyfriend for about a year and a half now. We were freinds previously for about 2 years. We started living together about four months after we started dating and did for about a year. At that point once things began to be more ';serious'; and school and ( I know he is afraid of commitment) I am now moving in with my parents, and after a short break up we are still having what seems like a silence between us. We have good sex and can talk about everything that isn't too personal but when we start that it is very hard or we just can't do it at all. We always mention that timing is bad for us with School and other troubles of being 21 getting in the way. We say we were meant to be together forever... but were meant to be together at a later age. I need some tips on things I may be doing to puch him away. I know a serious commitment is something he wants deep down and he has told me a couple times, but when I bring it up I just push him away. He shuts down. Help Guys!I would like some advice about my relationship with my boyfriend of a year and a half.?
It's funny how guys who are so afraid of a commitment don't mind having sex and and taking all the benefits of a commitment. They're not afraid to take, only afraid to give. He'll live with you and sleep with you, then turn around and say he's ';afraid'; of commitment. How convenient for him! I think if you got a spine and said a commitment or nothing, his little fears would change. But why should he change now? He gets the goodies without giving you any security.I would like some advice about my relationship with my boyfriend of a year and a half.?
To be honest with you if there is not communication then there is not much in the relationship.