Please help me I just found out my cousin is gay?

My cousin has acted very girlish since he was little. He is 18 and I am 14. He is 6 ft 6 but is skinny as a stick. I always suspected he was gay from his behaviors and since last year, he had a piercing on his right year. When ever I ask him, he always says he dosen't care if its on his right ear. He has always denied the fact that he is gay. Today I was having lunch with a family friend and her daughter and she told me my cousin is gay. I said noway but then she showed me a pic of him kissing a guy, I swear my hurt just cracked and felt like i was dead. My family is know for our manly ways. His dad is my dad's brother. His dad is always very manly has a very deep voice and smokes. My dad now tells me don't hang out with him that often anymore. What should I do??? It is heartbreaking for me to find out my bro is gay. His favorite show has always been Gossip Girl. He hates sports. Always wash his hair before leaving his house, and walks like a model. Favorite shoe is converse with very weird colors and always wears a handbag with avril lavine on it. What should I do??? Should I talk to him about it or what???