Flirtationship with my guy best friend (who also has a girlfriend,) where do we go from here?

Anonymous
So this guy and I have been friends for about four years, but only got close last year. This guy has a flirty personality, but with me, he's a little more interested. We started with a little flirtationship and it has grown into something more. He hugs me, "guides" me by touching my lower back, will poke/tickle me, play with my hair, leans on me, took a nap in my lap, "warms" me when I'm cold, and ect. I'm almost positive he likes me. And I like him too. On two different occasions, we've both separately gotten drunk and expressed our feelings for the other.

The problem is this guy has a girlfriend. She's awful to him. She treats him horribly, and very publically. One night, he and I were talking and he told me that he has had an on and off crush on me and that he's never done anything with me because he knows "I don't like him" and that he has too much respect for me to draw me into something awkward... but he already has... I really just don't know what to do. He's one of my best guy friends and we have a lot of classes together so I don't want to totally abandon him, and I'm scared to express my feelings to him outright because he told me he doesn't believe in the friendzone.
Flirtationship with my guy best friend (who also has a girlfriend,) where do we go from here?
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