Whats wrong with me being in love with my bestfriend (He's a man like me)?

Hello frnds, can u help with my very big problem regarding on my emotions or my uality I guess. Im a man, and I know from the start that Im straight, I've no doubt with that. I've been into many relationships with girls and I really love girls. I cant imagine myself being a gay, bi, bicurious, whatsoever. But recently I've been into this very strange feeling onto my bestfriend. The worst is that he is a man like me. At first, I tought that it was just a "one-day" feeling but I noticed that I've been thinking him in all the time. I think I am in love with him. I never felt this to my past relationships and I know I never love this way again. Everytime he's with me, I couldnt hide my feelings to this guy..I wanna kiss and hug him. He's my life. I think I could not live w/o him. Until one time, I kissed him on his lips and he was so surprised. Then I told him about my feelings. He couldnt believe it. To make d story short, we had and I loved it. That was d best ever. Am I gay?