We are more individuals than you think. It isnt productive to try to categorize yourself..."am I this or am I that...". You are Ayem and that is unique, one of a kind person. end!
Having said that, your journey is to try and find yourself whoever that might be and find happiness at the same time. Unfortunately one or two people are going to get hurt along the way so it is time to consider a life of full honesty with everyone. That doesnt mean you've been dishonest, it means more open and frank at the same time soft and caring. If your boyfriend cannot cope with this new woman then thats the way it is, you might still remain friends.
The other possibility is pure confusion in that if you were to pursue a lesbian relationship it might not be what you thought it was going to be. No harm done, keep searching, enjoy the search, discount the cruel sector of society that reject you.
Google this please-
Beyondblue topic you are still a jigsaw piece