he is gay but????

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the classmate/friend who was teased to me before, i think he really is gay because he acts like one, though a conservative kind, puts powder, combs hair, and also often looks at the mirror. His friends including me are all girls, but then it's so weird because there was like a mini confrontation. I was videoing him before and i showed it to him and also his friend that is a girl. That girl asked me if i was having a crush on him, i denied. Since then, my classmate who is suppose to be a gay keeps looking at my direction, keeps appearing. And when i bumped into him accidentally, he had that glitter in his eyes..really..it was so weird and then he has that expression on his face whenever he looks at me..it's like a smile and a sparkle in his eyes..and i believe that he thinks i like him. why is he doing this if he's suppose to be gay? what should i do? help!