Why does my best guy friend treat me like his girlfriend, but says we're just friends?

My best friend and I have been friends for a long time now, and recently he started showing affection towards me and acting like we’re dating. We’re very comfortable with each other and I mean REALLY comfortable. We would send each other voice memos of us farting and rating it. We could talk about anything and do anything together. Yes, I do like him, but I’ve never confessed or did anything to make him think I do. Recently he started doing affectionate things like hugging me from behind, holding my hand in public, kissing my head in front of people, cuddling, etc. We’ve even slept on the same bed together while spooning. Sometimes he would say really sweet things to me that a friend wouldn’t say, but a boyfriend would. But we never kissed or did anything beyond that. He initiated all of it and I always went along with it. Random people would tell us that we’re such a cute couple, and he never denied it. Just recently, he randomly asked me if I think that he’s leading me on and proceeded to tell me although he would love a relationship with me, he only sees me as his best friend. And that if we were to take things further, he wouldn’t want our friendship to be ruined if something were to happen. He expressed to me that he gets attached very easily to where he can be very affectionate to the point of romantic acts. I know that I’m the only person that he does this with, because we spend 90% of our week together and he’s not the type to hookup with girls left and right. On top of that, his school schedule is very busy. It kind of stung a little because he has all the things I want in a guy and I wouldn’t mind being in a relationship with him. He told me that he still wants to do all of this platonically, but if it gets too much for me, he’s willing to stop. I confided in some friends and even they were confused. They think that he either likes me, but is afraid to commit to a relationship, is emotionally unavailable, or really only sees me as a friend. Thoughts?

Why does my best guy friend treat me like his girlfriend, but says we're just friends?
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