Hurt and confused

Hello. I have been in a relationship with the same person for the past 5 years and only recently realized that I am bisexual, or at least I think I am. I confided in my boyfriend about this, but he did not take it well. He overreacted and felt threatened that I would leave him for another woman despite the amount of time I had been his girlfriend, and even longer amount of time that we had been friends. This was a few months ago. Last night, the topic of bisexuality came up again when he had seen a photo of a mutual acquaintance who came out as bisexual on social media. My boyfriend must have forgot that I told him about my sexuality, because he basically shared his opinion of bisexuality, saying that it is a phase and that people eventually figure out what they want. I became upset and this started a huge fight. His defense was that I don't "act" bisexual, and that I have never been with a girl so I must be confused. It really hurt my feelings that someone I had (or thought) such a special bond with is doubting my own judgment. It hurt. It really did. Telling my boyfriend that I am attracted to women was a huge and very personal step for me because I had always thought I was straight but just...quirky. Nobody else knows this about me.

Growing up, I have experienced crushes on my friends and on random girls. I still get nervous talking to girls I find attractive. I have experienced hurt from not fitting in with all of the girls as a child, as well as times when I was a little bit younger (maybe 14-16) where I weirded myself out for picturing myself dating or kissing a friend, knowing that it will never happen due to their own sexual orientation. I have always been curious about the female anatomy and only recently realized that being bisexual just fits me, even though I have never been romantically involved with another woman. If/when I watch porn, sex that involves M/F or F/F interaction both catch my attention. I always told myself that I am heterosexual even though I have had these attractions to women all of my life so far (I am only 19). Is he right, that because I have never been with a woman, I cannot be bisexual?

I feel as though I have nobody to talk to in person because the bisexual community is so heavily judged. My boyfriend said that his point of view will never change, and that this whole thing about me being bisexual does not matter because I am with him regardless, and because I am with him, he sees me as heterosexual. He believes that he accepts me, despite the fact that he doubts my honesty about such a sensitive and personal topic. To me, he is turning his head the other way and choosing to believe that I am straight, which is not acceptance. I said that, and I also said that it's not love to see me so broken about the way he perceives my sexuality, yet still believe it is not real. "Even if I started to believe that you were attracted to women the same way you are attracted to me, this doesn't change anything", he said. Yet I am still so hurt about his beliefs. He is the only person I wanted to share this with, because I thought that he would never hurt me the way he did last night. Everything was absolutely perfect up until this fight happened. I thought I was going to marry him. He was my best friend in the world, and the only person that has been there for me through thick and thin....unless it pertains to my sexuality.

I feel sick to my stomach knowing that I cannot change his opinion. Maybe he is right, like why DOES it matter to me so much whether or not he believes that I am bisexual if I am with him? It just honestly hurt me when he belittled this entire experience of realizing that I am or, at least could be bisexual, saying that I need to talk to someone else about this if it's so hard for me to cope with him not believing in bisexuality. He does not realize the amount of judgment the bisexual community receives and that he is part of the problem. No matter what I say, he is so adamant about his opinion. I am so hurt, because the reason I told him and ONLY him was to avoid this very reaction that I never thought he would partake in. I cannot afford to lose friends.

At this point I am at a loss as to whether or not I should continue this relationship. We cannot see eye to eye on this topic, despite me being a real-life example right in front of his face, and not just some stereotype. Everything was fine, just fine, until last night. I don't know what to do anymore. I don't know if this is worth a breakup if everything was fine until we disagreed, especially because he is right about me being with him, a male, at the moment. I am lost. Especially without my partner and best friend.