He wants to get married

He wants to get married when our LO is at least 4..but I want to wait longer and he's upset with that because he already wants to make his wife because I'm "THE ONE" and yes we have a beautiful baby together but I'm just not ready and I'v talked to him about it and hes been so sad the past 2 weeks I don't want to give in and agree to that because that's not what I want but I want to also compromise with him because I love him. I want to be his wife someday I do. But him and I have other things to focus on rn like me finishing college and him working for his promotion at work and raising our LO. I wouldn't mind being engaged for a while rather then get married right away and hopefully we can work out something