I have no idea if I’m bisexual or lesbian and I’m in a hetero relationship

I know that there is no real solution to my problem, but I really feel the need to talk about it and I hope that other people can relate. So I’m in a relationship with a man and he’s everything I’ve ever hoped for. He’s my first romantic relationship and I love him deeply, but lately I’ve been having these thoughts about women. I think I’m bisexual because I find women really attractive and have fantasized about them. I feel like I can get turned on just by looking at a woman but that’s not the case with men. I do get turned on if we kiss and have intercourse, but I’m also scared that I’m confusing my own pleasure and making the other person feel pleasure. I’m scared I’m just lying to myself and that deep down I’m a lesbian. I’ve been watching lesbian porn for most of my life and so I’ve always been sexually attracted to women but never thought I could have a romantic relationship with one. Today I’m very much more open to the possibility and can see myself dating a woman. I’ve only ever really had crushes on men, but wouldn’t fantasize about them like I could with women. So I’m scared that I’ve had these crushes because my brain was telling that I should like guys because that’s what society wants. I’m very scared and can’t stop crying, cause what if I hurt my current boyfriend ? This is the last thing I want. Sometimes I think I should just break up with him to avoid having to do that in a couple of years (if I finally discover that I really am a lesbian). I know he wouldn’t be open with me having an adventure with a girl, so I can’t ask him that. I do want to be with him, marry him, have children etc… Bug I feel like not having experienced this side of me, I don’t know who I am and I don’t know if this feeling is ever gonna go away. He is my best friend and sometimes I wonder if I’m confusing friendship and actual attraction. I would love to hear some advice if any of you was ever in a similar situation!