3some back fire!!

My boyfriend and I wanted to spice our sex life up and had a 3 some. I always wanted to do it and same with him. So we do it with another girl. It was the amazing having sex with a girl it was the best thing I ever done now I only want to be intimate with girls I'm not sexually attracted to my boyfriend now. Pretty sure I'm a lesbian because how I can't stop having sex with the girl we had the 3 some with. Now I have to beak up with my man. Don't know how he's going to take it.