Michael shook his head and pushed him away.

Gabriel had said it himself that he considered them very good if not best friends. The kiss implied he also found him physically attractive. Affection + interest = love or at least the foundation of it!

"G' 'way 'n' come back when you figure out what the crap y're feelin', Gabe. It's one thing t' say y' not in love, it's another to say it when y' pretty much are."