AITA for not telling my boyfriend i'm bisexual?

(Using fake names in this, no ones real name is used)

Me (19M) and my boyfriend Daniel (21M) have been dating each other for almost a whole year now. We're almost polar opposites in terms of personalities, but we would always get along. 

Me and him were having lunch at his apartment yesterday with my friend Eric (19M), and everything was going great. Me and Eric have known each other since we were in eighth grade, so we were telling stories from  highschool to pass the time. This was great until Eric made a joke about a girlfriend i had my junior year. She was my only relationship before I met Daniel, and it only lasted around 6 months. But anyways, Daniel started acting weird. He did a forced laugh and said "Girlfriend?" to which i just said "yeah?" After this, he was acting really strange. He kinda just got really quiet until Eric had to leave. 

He than started asking me a bunch of weird questions about said girlfriend, but the one that ticked him off was when he asked if we ever had sex and I responded with yes. He freaked out. I didn't understand the problem, and asked why this was so upsetting, to which he said "If i had known you liked girls I would never have asked you out in the first place!" This shocked me because 1. We've been together for a while now and I felt like this shouldn't change the relationship and 2. Whats the deal with me liking girls? I never thought to tell him cause it really isn't a big part of my identity. And besides, I'm very loyal. I've never thought about seeing anyone else but him in the time we've been together. So i asked him why it's such a big deal, and he straight up just said that Bi men give him the "ick". I felt like this was a really weird opinion to have, and a really immature way to phrase it. I asked why, and he told me that theres a bigger risk for cheating and that he just doesn't wanna date a dude who's had sex with women. After this, i just said bye and left. 

I haven't talked to him since, he tried texting me this morning saying he'd like to talk to me and try and explain the "situation" more, but I really don't wanna hear it. I love him and i know i should hear him out, but his words hurt and I'm scared he's just gonna break up with me. AITA for not telling him this when we met? Should i hear what he has to say?