Woman attraction

So at work yesterday there was a girl. She was really hot. She wasn't showing skin or anything revealing. In fact she was all covered up. Just t-shit and jeans. I found myself really attracted to her. I don't think I've ever felt that way towards a girl. I have a bf and now I'm doubting my sexuality. Can it be that I'm attracted to girls too? I know I like men. I love men! Lol but yesterday kinda caught me of guard. Any thoughts on this?