Nobody here knows him in person, only you know what type of man he is. I wanna believe that he is serious in the relationship and he wanna have a future with you though it is you who coud tell.
I understand, we women in general need a commitment for security. Yet marriage is not necessary a garantee for long lasting relationship. He is being self-protective and cautious, if you do love him, give him enough space, as you never know, what's ahead of both of you.
It doesn't mean that he should lead your life by telling you what to do. If I were you, I'd plan for "just in case". In my humble opinion, not be pushy in the relationship, let nature take the lead, while be well-prepared for the life without him.