In the kindest possible way, why would he propose? You aren't going anywhere if he doesn't, right? It's not like you'll walk out, is it?
When I was at exactly your stage and wondering if he really did want to marry me, I did a lot of soul searching, and realised I had two choices - I could either leave and find someone who did want to get married, or I could stay with DP, knowing that it may never happen for us. I chose the latter because in every single way we were perfect.
However, because I chose this less legally stable option, I decided I would always stay working full time, that going forward our joint expenses and assets could clearly be legally confirmed as joint assets and ensured that if I wasn't going to have the legal protections and benefits of marriage, at the very least I would not be left vulnerable if he fucked off and left me with a baby.
So, ask yourself do you just want to be a wife, or do you want to be with this man, even if it means that you may never marry. If it's the former, break up and go find that husband you want. But if you want this man, then start rearranging your life so that you don't need marriage. Go back to work and start building your own pension, your own savings and having your own income.