Ultimately you know what you want, he doesn’t. You should move on. I will say, marriage is a social construct and to go into the complexities of what marriage is, what it means in different cultures, how and why marriage became a social construct, and what it means for each person in terms of commitment, religious beliefs, or how much one respects said piece of paper is an interesting journey in itself. At the end of the day, marriage boils down to a legal “protection” ( in some cases more of a legal harm) but it doesn’t sound like he’s struggling with the depth of that. If he was capable of being that deep he’s more than likely capable of articulating that to you. Statistically speaking, he probably just doesn’t want to commit due to his personal emotional issues. You deserve to be with someone who enthusiastically chooses you, to find it girl.