I've said this before, on many threads like this, and I'll say it again now.......
No one should get married unless they want to
I wouldn't want to marry someone who had to be dragged down the aisle
I'd want my DH to think he was the luckiest man alive to be marrying me
I think OP is being fobbed off with suggestions of getting married with their 4 year old carrying the rings
Don't give ultimatums eg marry me or I'll leave
But, if marriage is important to you (which I sense it is, despite your protestations to the contrary), then it's reasonable to say that you would like to be married, you sense that he doesn't feel the same, that's absolutely OK / his choice, but you're now beginning to wonder whether you wish to stay with him unmarried, or if you might be better to move on. If he let's you go, that's your answer
In other words, be master of your own ship
In the meantime, manage your finances as a single person, keep your own savings, don't give up work etc