How can I tell if I'm gay?

During the NBA finals there was a group of people over at my house. My 3 friends and our girlfriends. We were all rooting for the Mavs. Each made basket we'd give eachother high fives or whatever. It was all cool... Well when the Mavs one we all jumped up and cheered and Jason kissed me. Like a real kiss with tounge. I didn't fight it. It was real embarassing though. Everyone was just staring at us and my girlfriend started crying and ran out. I have told her that it was Jason and I don't know what he was doing... But, I still think about it. I think I might be gay for him.