I'm a hopeless romantic

I am in love with a friend of mine. We have never officially dated, but we have always been physically close (nothing sexual). A few years back he asked me out, but at the time I rejected him because I felt like it was the right thing to do.
Recently I had developed feeling for him and around that same time he began avoiding me; Ignoring me or giving very short replies in text or in person. We hadn't hung out much as of late, and I thought I had done something wrong. Even worse still he had started to become really close with another friend of mine, and although I love her as a friend I'm envious of her for having something I never knew I had until I lost it.
He is moving away soon and I'm going to try to keep reaching out to savor the final moments I have with him.
Our relationship is complicated and most of the time I can't seem to grasp what he's thinking. We have really high highs and really low lows.
If any of you have any insights, I would gladly read them. (this probably isn't the site to be ranting in lol)
Mostly I wrote this to just clear my head because I've been really confused lately.