What should I do 😞

My boyfriend and I are going to make 5 years this July. We just had a baby 7 weeks ago. We’re both 21. Now here’s the problem he doesn’t believe in marriage, i obviously want to get married in the future especially since we have our babygirl. I’m getting to a point where it’s like why even be with someone that doesn’t want what I want. But I don’t wanna leave cause I love him and everything’s been good. He talks about never leaving me and the baby but I just don’t know what to think or do. He told me this when I was pregnant and I didn’t even want to get into that topic back then.