Confession/rant

I'm in love with my best friend and I need to not be. When I told him I liked him (almost 2.5 yrs ago) he said he liked me but was moving an hour away and about to go to college and had a full time job, so didn't want a relationship. So we started messing around (whenever we hung out, which wasn't supper often) and have been for over two years, until I kinda ended it a couple months ago. It was really an awful idea bcs we're both somewhere in the demisexual range, so it's not like we were just "friends with benefits"; there are definitely feelings involved. Now he's moving to Massachusetts indefinitely. I'm still in love with him, but I know it's a bad idea for several reasons: he's already said no to a relationship, his feelings towards me are clearly not as serious as mine towards him, sometimes when he's busy I barely hear from him for days, and he has a few diagnosed mental illnesses which sometimes cause him to be really tired and/or have little interest in anything in his life (except food, sex, and talking to me, in which case I'm doing most of the talking). Regardless of how stupid I know it is, I can't stop thinking about him, and stressing out about him moving so far away. I don't really need advice on this, I mostly just need to relax. All this stress this is causing me is partly because I'm pms-ing, so it'll be better soon.