How to tell a guy you like him when you're gay?

find out first if he is gay, how hard can it be your already out so thats one less hurdle

Find out if he's gay first.

How do I find out if he's gay without asking him? He could react badly to that like the poster above you said.

How do I do that without asking him if he's gay? If I ask him that then he'll assume (rightly) that I'm asking because I like him.

Well there's the tricky part. You shouldn't ask him, you should either wait to find out or ask someone else. I know it's a pain in the arse but it's the most risk-free way of doing it.

To be honest, I think you shouldn't tell him. If he is gay/bi and he knows you're gay/bi
a) He doesn't like you
b) He's not ready (to come out, to be in a relationship, to be in a gay relationship)
c) He's too afraid to make the first move

If it's a or b, you can't do anything about that. If c, you've just got to give him an opportunity to come out.

I've made the mistake of leaving a guy for about a year cos I wanted him to come out first just to be sure. He acted too friendly to be straight, he was very touchy and so on. I got bored waiting and eventually told him. He had no idea I thought he was gay/bi and now we're not even friends. I'm telling this story as an example of how it can backfire massively if he doesn't feel the same, even if you're certain he does.