What's up with labels?

I have a boyfriend and I love him to death but sometimes I am physically attracted to the same sex. I don't get attracted to women my age, I am always attracted to older women. I love having sex with my boyfriend, we have sparks, but I can honeslty say I have fantasized about other women. Does tht make me a bi sexual or lesbian cause I believe people shouldn't look at what's between their legs its what's in their heart.