Bisexuality?

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I know I'm straight, my ex was bi. I'm confused on how bisexuality works. He was good in bed, he knew how to please me. But he said he's giving and received oral with a guy before and he'd do it again given the opportunity. I had a picture of my gay friend and I in my room. My ex told me he was cute. He'd get all giddy if he mentioned a flamboyant guy he knows. He wasn't flaming either. I didn't know he was bi until he told me. He treated me like shit though. He made fun of me for being a being a virgin and when I revoked the consent he got mad and said, "I thought you wanted it" I would get so angry at him because he also made remarks about my family and he was basically forcing me to do things I didn't want to do. I have a gluten allergy and he wanted me to give him head, he's like, "don't worry there's not gluten in it" I was so uncomfortable and felt humiliated. I think he was so insecure about himself, he's body and his sexuality that he was a douche. He'd always talk about all these other girls around me and that made me feel bad about myself. He also told me when we were together that he started fingering his asshole recently. It's so weird.. He rushed sexual things so fast and same with meeting his parents. He wanted to basically show his parents he's straight he'd make them see he was kissing me in front of them. I think I was a cover up. When we broke up which I basically broke up with him, he immediately got a new girlfriend. I think that relationship which was my first was just so weird. What do you think?