Leave or stay? Need advice

Been with my boyfriend for 6 years. I just bought a house last year. Meaning I took the loan out and is in my name... Anyways, we have a son who is 15 months who was conceived while I was on the pill. He now tells me he doesn't ever want to get married, I do and always tells me no more babies. I'd like one more. He is 31 and im26. To you, would that make you leave? It's hard to split up, I won't get to see my son as often as I do now :( the one thing I'm
Concerned about. Advice please?!