He sees you "getting away" and is pulling out all the stops. He thinks that talking marriage will cause you to just hang in there the way things are now. The worst thing you could do is either marry this guy or buy a house with him. If you are in any way legally tied to him, there will be hell to pay later when you want to leave. I'm sure you know all this and don't have any intention of marrying this guy. This guy is not the guy for you. He's a user. I just felt compelled to say the things that I hope are already going through your head.
Wouldn't moving into that place with your friends be an answer to several problems you have been having, like not being able to rent alone as a woman and also having help with the bills? Sounds like a pretty good deal to me and at least it would get you out from the dead end situation you are currently in.