I'm going to ask my boyfriend if he's gay
That may offend him. Why do you need to ask him if he's gay?
I don't trust him. I'm very self-conscious about it
Just because you have a suspicion about something does not entitle you to be rude. You should trust your boyfriend more because if you don't he will not want to be your boyfriend anymore.
You are not helping me. I'm just going to ask him since I think he's gay.
I feel like you thinking that he's gay is something that making you distrust him and I do not think that's healthy. If you can't trust him in your relationship, then I do not think that it is fair of you to keep him as your boyfriend and it is better for both of you to find other people that you can fully be happy with and trust completely.