What did he mean ancd why in god's name did I have to kiss him!

So, I was out drinking with work colleagues tonight.. There's a guy at work who has a very flirtatious manner. I suffer from the same affliction and so we always flirt. I know that he's attracted to me and although I live his personality and I can honestly say that even with his smile he brightens my day,I am not attracted to him. We were out and drinking, he kept saying that I should "come out of myself at work" but so long as my friends and family know the real me it's ok... I know that there was a rumor about me at work. I think that I should not have kissed him. The rumor was in the back of my mind the whole time. Again, I felt little or no physical attraction. My lack of physical response alarms me, if anything and I hesitate to use the correct adjective I felt the opposite. I now wonder how bi li really am? I kissed him to dispel a rumor which I am fairly certain he knew about. I sm disgusted by my actions. He's a great guy and I don't want to mislead him, What if the life I have envisaged for myself is all wrong and I belong with a girl? I am not afraid of this but hope there is someone for me. What am I doing!?