Only he can answer that question. He would probably say bi because he doesn't want to accept the fact he is gay.
Married gay men refer to each other as "husband."
No, Not necessarily. There is nothing wrong with straight men chatting with gay men. I'm pretty sure he knows what sexual orientation he is, if he is married to a woman, and not a man.
No, gay men are men. Men usually get married in suits or tuxedos.
A man who is sleeping with a lot of women can be a simultaneous dater. However, if a man is dating or married to another woman and is sleeping with a lot of women is a cheater. It's the same with women, if she sleeps with a lot of men. Also he can be called a manwhore or player.
Nobody leaves their wife to be gay. If a man leaves his wife for another man, it's because he was already gay, and got tired of living a lie.
The vast majority of gay men married to women are closeted, so the percentage is unknown.
In some States marriages between same sex males is not recognized, but the two men are just as in love as if it were a relationship between a man and a woman and therefore the gay men wear their wedding bands because they feel they are married.
No. A gay man is someone who is sexually attracted to other men. A eunuch is a castrated man (who may be gay or straight).
Gay men already are men. They do not pretend.
If two men marry each other, each is considered the other's husband.
No. Gay men have just as much value in society as straight men. In some cases, more so, because some gay men adopt the children that straight men abandon.
No. It is only gay if the man is sexually attracted to other men.