If I was in a relationship, I would break up with my boyfriend

If I were in a relationship, I would break up with my boyfriend So yeah, basically the first time I met him I thought he was an annoying asshole who didn’t even understand me or our relationship. After a few weeks of dating he seemed like a nice guy and I knew he didn’t understand me because we had no idea. So I met him through the dating app Tinder and we became friends and started talking for months, then a couple weeks before we had sex he said he wasn’t gay, then after he had sex he said he’s “gay” and said he likes guys so we had a little argument. I don’t understand why he doesn’t know us, and I want to break up with him