@CaptainDelca It can be difficult when someone close to you is unaccepting. I know it can be very stressful, and even painful when people dont understand. I think the best thing to fo is just tell him and get it out of the way. He may react badly, but he'll react even worse of he hears it from someone else or if you're forced to tell him suddenly. He may not react as badly as you think, and might even become more accepting of lgbt people because he knows one. It could hurt his feelings and worsen his thoughts about lgbt people if you keep it from him and he finds out eventually.
That's what i would do, but that doesn't mean you have to. I just wanted to help if at all possible.