So what if he doesn't say "I'm gay"? That's one thing I'll never actually say. I like guys, he likes guys. Some people like girls, but you don't hear them going around shouting "I'm straight".
If you find the need to categorise him, it doesn't mean that he has to do so himself.
The fact some of you literally need him to say, "I'm gay..." is ridiculous. He just talked about getting another boy's booty and licked his lips. Proof enough for me, although I don't find him to be cute.