EDIT: Thanks Chance. I think that's pretty much what it came down to in the end.
We talked. It was a lot more of me trying to convince him, and him trying to convince me. He eventually said a straightforward "No". I know he's right, but it sucks to be rejected.
Our final discussion came down to whether or not we could salvage our friendship. I told him that I would need some guarantees from him, even though they may be selfish. First, we can't get into a relationship until college has started and we both have friends to fall on for support. Second, if one of us is having a bad day and lets the dreaded "I love you" slip, we have to say it back. Even if it comes with a lecture about how "we shouldn't say that anymore". He agreed to those.
So back to being friends, but I'm taking a different approach. Skype isn't gonna alert me when he logs on anymore, the Spotify playlist we made together is being deleted, all the artifacts he gave me and stuff we made together are being put in a box and placed in my closet. Every little thing that reminds me of him will be tucked away for me to find later as memories. I'm gonna go volunteer at the animal shelter more often, hang out with friends, and try to be a higher spirited person. I'm still going to talk to him, but this time I don't want my life to revolve around him the way it has for the past two weeks. Or rather, the past 9 months.
If anyone has any other suggestions for getting over the emotional relationship, please tell me. I know that the easiest way to get over somebody is to go cold turkey, but that will only be a last resort.