<human>: Can you condense the text into a few key points?

I'm afraid most of this won't make sense as it doesn't have much structure to it, I just want to get out as much information as I can.

We originally dated for no longer than 2 months about a year ago. At the time both of us struggled with mental illness and he broke it off.  
About a year after that (Oct last year) he contacted me again.  

Originally it was just for sex which I knew and I was totally fine with. But it ended up turning into something a bit more than that. I eventually transitioned from having sex at night, staying there and leaving in the morning, to hanging out during the day as well, to practically living with him. It's about as close to a relationship as you can get without making it official.

A month ago he moved 9 hours away to his hometown to go to college and get a bit of a fresh start. We tell each other we miss each other all the time. He talks (half-jokingly) about having me come live with him. We met halfway between our towns this weekend and the time together was fantastic. He has a hard time expressing his feelings, so the little things like these remarks about me living with him are pretty important.

I have very strong feelings for him. He hasn't slept with anyone else since he had moved - he knows I'd be upset if he did, but I also have told him I can't stop him and it's entirely within his right because we're not technically together. I feel like there's some sort of feelings from him too but I'm scared they're not as strong as mine.

I want something more serious and permanent with him. I want to be his and him to be mine, as cheesy as that sounds. I feel a little like I'm being unfair to ask for a serious relationship after he's moved away.

I don't know how to tell him without scaring him off. I really value his friendship and affection and I don't want to lose it by asking for a relationship when he doesn't want one.
<bot>: Have strong feelings for FWB that just moved 9 hours away. Think he might too but scared they're not as serious as mine. Want to tell him but don't want to scare him away.