Thanks for all your advice, everyone, I really appreciate it.
I think that for now, I'm not going to do anything about my friendship. Maybe when I'm a little further along in my therapy, maybe once school's over so that I only have to deal with one stress at a time. I think you're right, madisgram, right now my gut is telling me that he's not a great influence in my life. Maybe when I feel a bit better and more secure that will change, but for now I think he might just hold me back.
I was thinking about it, and I'm not entirely sure how much I miss HIM so much as the place that he occupied in my life. He was the one person I could run to about anything. He would call me in the middle of the day to make sure I'd gotten out of bed for at least long enough to shower and have something to eat (that's when the depression was at its worst). But I was also too dependent on him, and I think that while it's great for us to have that kind of support while we're depressed, in the end we have to do the majority of the fighting on our own, and get used to standing on our own two feet instead of leaning on someone else. The only one we can ever really depend on 100% is ourself, it's just that I was not confident enough to think of myself as strong enough to sustain my own happiness. Now that I'm feeling better, I find myself missing him only when things are starting to get tough again, when I feel like I need a crutch instead of dealing with life's problems on my own.
Oh, I'm babbling now. Anyways, thanks for all your help, everyone. I love you all.