My partner says I’m not ready to get married?

I’ve brought up that we should get married for months now and my partners saying “your’e not ready” what could this possibly mean? This all started because I didn’t want to go into the city for Christmas and new year and we had an argument about it. He said he was going to propose there after the argument stopped and now because I didn’t want to go he’s saying “you’re not ready”. Im really confused as to why I wouldn’t be ready because of this. I always show him pictures of rings even wedding venues and he seems disinterested. Actually he has nothing good to say about marriage. We have been living together for 2 years now, am I fooling myself.
My partner says I’m not ready to get married?
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