No engagement, then no apartment?

My boyfriend and I have been thinking about moving in together. After thinking about it multiple times, I've decided that I should wait until we're engaged. One of us would end up moving to the other side of the country for the other. He wants to stay for school and I want to stay for a job and school. Either way we'd make a huge sacrifice for one another. I'm thinking about telling him that I don't want to move in together until we're engaged. I don't want to pressure him into getting engaged to me, but if we're going to make such a big change like that I want to know there's that commitment. I'm not ready to get married though, I know that and I've told him that before so I wouldn't think of it as being as pressuring. I know that he really wants to move in together and he knows I really want us to, so I don't know if that'd be pushy. I just don't want to say anything to make him feel like he's being pressured into engagement. Just want some opinions on if I'm in the right mind or it's asking for too much.