New sexual fantasies

I don't consider myself to have an orientation. In high school I dated more women than men, and after high school I've only been dating and having sex with men. I don't think I'm straight even though I prefer men sexually and romantically, but I don't think I'm bisexual because I don't see myself marrying a woman. I've recently began to have sexual feelings towards women, particularly Elsa from Frozen. I work in retail and today I had to work in the kids section where there are several aisles filled with Frozen products so I spent all day having NSFW fantasies about Elsa because I couldn't escape seeing her face. I've never had sex with a woman, but recently I've been fantasizing about what it'd be like. I'm pretty confused because I have a boyfriend, but we've been dating for over a month with no kissing, flirting, or anything romantic, so now I'm feeling bored and I guess that's why I'm having these fantasies, but why women? Why not just have fantasies about men? I do have fantasies about a male celebrity I like, but right now all I can think about is Elsa and my female best friend who I've been somewhat intimate in the past with.

I guess what my question is is why I'm having these fantasies about women all of a sudden and so passionately. I don't think I want to date a woman, mostly because it'd be so confusing, but I'm craving a sexual encounter even though I have a boyfriend.

I am a 20 year old bisexual female in a loving and committed heterosexual relationship. I fantasize about women sometimes and on the street pretty women catch my eye but I never dwell on these thoughts for too long or ever think about acting on them because I love my boyfriend. However, I have opened up about my feelings to him and he is understanding.

Have you let your boyfriend know? I have a personal bias against bringing others into the bedroom with you and your significant other but I guess that's an option. If your boyfriend is not supportive, would you consider breaking up with him in order to have the experience?