Real shyt, I'll keep it simple.
I think you and dude are on two different trajectories in life and he's slowly realizing it and waiting to see if you do as well.
Whenever a nikka can't give up answers to point blank questions, you have to read in between the lines and study the context clues. Sounds like he desperately needs you to have his back, but he doesn't know how to break it to you so rushing the marriage is his best way in his mind to bridging the gap.
If I were you, I'd break it off. Marriage won't fix this and both of you will prolly resent each other for keeping the other away from their destiny.
Good luck.