Am I gay or bi?

[confusedboy101]

Recently I found out that my girlfriend kissed my friend which hes gay at 1st but found out hes bisexual. She told me it was nothing and she wish she never wanted to do it again which I forgive her. But during the time I was so furious that I wanted to kill my friend. He came to our apartment (my girlfriend, my friend, and I shared an apartment) to talk about the kiss and I told him " why I should I believe you?" and soon he kissed me. I pushed him and told him to fuck off and then suddently he told me he in love with me. Soon I keep having flashback but each time as time progress I pictured him and i kissing and making out. Am I gay or bi?