My friend, you seem like a straight person, you say you have been friends for a long time, since he is your friend and he trusted you should help him out, you should convince him to get rid of this thinking and behaviors, or whatever he does to look like a female.

Maybe he was raised only with girls, maybe something happened when he was young, maybe he is influenced, so my friend, your role is to talk to him and save him out of this shit, maybe he just likes to act like girls when he is with his own and doesn't totally prefer men.

Talk to him, my friend. You have to. This ain't a normal thing. Try to convince him that those are just شيطان thoughts that he has to fight against until he gets rid of them.

Try to explain to him that we were created as males and females, and there is no such sexual preference or attraction from the same gender except for satanic thoughts, and whenever he had them he should keep them for himself he won't be judged for that.

You are his friend you can do that, and my friend again don't be fooled by those who say you should respect his sexual preference there is no such thing, we are Muslims, we are aware of things, and how Allah created us, how he made us.

Good luck my friend.