In scenarios like this, you've got to let go of the idea that he'll spring a thoughtful, well planned, rose petal romantic proposal. He's just not that kind of man. Doesn't mean he doesn't want to spend the rest of his life with you if he doesn't want marriage though. But it does mean that you need to take the bull by the horns and do it yourself.
I did, and my marriage is no different to the ones who did get the instagram worthy proposal.
A couple of questions worth asking yourself as these helped clarify what I wanted is:
If you had to choose between him + never ever being married, or someone unknown but having all the romance/ wedding planning, and being a wife which would you choose?
And based on the answer to that, what do you need to achieve peace with either decision? so for example, if you went for option A, stayed, unmarried, what legal/ financial things need to change for you to be ok with that? if it's option B, what would a split & getting out dating again look like, and what would you do to achieve that?
For me personally, I took option A. I love him. I'm happy every day with him and I realised that I would rather be with him and be happily unmarried than with someone else and unhappily married. In truth, much of my wanting to marry was rooted in feeling like it was a kind of yardstick to prove to others that we were solid- I think this seems to be kind of where you are -that it's like a club or clique you aren't a member of and you feel that others judge you or your relationship as lesser to theirs because they had a wedding and some new jewellery.
Once I stopped giving a fuck about how others saw us, and saw any digs from smug marrieds for what they were, I actually wasn't bothered about marriage myself. He was happy to go along with a wedding, or not whichever I wanted. Eventually we did have the wedding and it's nice to have it done but we did it because we wanted to, and not because of the subtle societal pressure of status.
Hope the chat has gone well.