First of all, I'm so sorry. It's awful that someone you love and trust doesn't accept a crucial part of your identity. I agree with the others, you should break up. Beyond not wanting to date a biphobic/bigoted person on principle, he just disrespected a big part of who you are. He made you feel bad and ashamed of something you're proud of. A truly loving partner would never do that. You deserve so much better. When I came out as bisexual to my boyfriend he not only accepted it instantly but he soon became the biggest affirmer of my bisexuality and made me feel MORE comfortable with my identity that I did before.