I need help

I think that I’m Bi but I have a boyfriend and we’ve been dating for over a year, so I haven’t really gotten to experiment with it yet to really see if I am or not. The only thing I’ve done is my best friend and I made out at a party one time but we were both drunk so idk. I really feel like I could be because I think about girls and it turns me on but idk if it’s just a phase or what it is.