Im 13 years old, i am aslo gay, i need help, i think one of my friends is gay. But i don't know for sure. He acts like it, like, in p.e he checks out other guys boxers, he always avoids the subject of homosexuality, and whenever someone talks about it, he gets scared and quiet. I tryed to get him to tell me, but he just keeps saying no, I am almost positive that he is gay. How can i know for sure?