Tonight I gace up, my GF seduced me and I could not stop it.Never done it before, what is happening to me???

My GF, she is a vixen, gorgeous girl, and, she is been seducing me....my defenses kept going down for weeks, finally she did it tonight, she really succeed, and, now I am at home, and, I feel guilty, but I also think I wanted it. I love boys, this is just a different league, am I bi??? How could she do it, she is transformed me....I am a little scared, how did she do it??? all I do is tink of her.