I want marriage ... he doesn't.

We've been together for 5 years and have a (almost) 2-year old daughter. At the beginning of our relationship, we always were on the same page as far as children and marriage is concerned. But now anytime I bring up the thought of marriage, he is uninterested. He's really sweet and takes good care of me. But I don't want to be a "baby mama" for the rest of my life. I want to be his wife. I want more. And I feel like I'm only hurting myself by staying in a relationship with someone who doesn't want to marry me. 
What should I do? Should I leave?