is he gay?

I’ve known this man since we were 14, I turn 24 in 2 weeks. I’ve liked him since day one. He took my virginity, he’s the father of my babies, and I thought I would always be with him. But he also use to cheat a lot. It’s been 2 years since he’s cheated, or since I’ve found out at least. He’s also been with men before, in high school mostly. One of them was my cousin, he said they had sex but never kissed because that’s “too gay”. Another was a guy we went to school with who was one of the only openly gay kids at the time. My boyfriend kissed him in the school bathroom agaisnt his will. Another story was with a guy who worked at our Starbucks, apparently my boyfriend got head from him but didn’t return. I as we got older and his behavior seemed to get better, I assumed he had changed and wrote his behavior off as us just being children. Within the last year or two he finally admitted to being bisexual openly. We have a mutual friend who is gay and my boyfriend has “jokingly” flirt with him in the past. Recently we were smoking with his sister who is also friends with him and she mentioned him. My boyfriend’s words were “him and I are so much alike. Do you think I’m gay?” And I looked at him sister kind of like 😯 (idk how to explain it, but shocked.) and he didn’t switch up at first, he was trying to explain why he thought that. Last night I asked to use his phone as mine was dead and he usually doesn’t care but the last few times I’ve had his phone he’s been weird and has had to hold it or look over my shoulder at what I’m doing. And I don’t got through his phone, I only ever use it when I don’t have mine or when we listen to Spotify in the car. I was trying to find something on Facebook and noticed he had a trans kid we went to school with in his search and they were friends. Later I went on my phone to look him up and I couldn’t find his account. I went to my boyfriend’s Facebook and noticed he has almost every post hearted and when I click it shows a “data unavailable” pop up. Maybe I’m being crazy but idk. I’m not even mad at him honestly, there are other aspects of our relationship that have led me to kind of check out. He doesn’t help much with the kids or house which is why his sister visits so much, to help. He’s also not romantic at all, he treats sex like a chore and I’m lucky if we continue after he gets off. I’m bisexual also so if he is into men then I don’t want to waste my time or his anymore.