Should I tell my friend her ex-boyfriend is an undercover gay?

My female friend recently broke up with this guy from Saudi Arabia--he claims it's for cultural reasons because she is not Muslim, Saudi Arabian, and she had a child out of wed-lock. He claims his parents will stop giving him money if he stays with her. He has strayed quite a bit from his culture since being in America and has tattoos, does not attend Mosque a lot, and goes to clubs.

Me and him were really good friends, and had a "bromance" I guess you could say. I am not gay but I guess he was very attracted to me. One day, after we went to a club I had to sleep at his house because I was drunk. The next morning we went out to eat and I needed a new shirt to borrow so he gave me one of his. When we were at the restaurant he sat right across from me and kept staring at me the whole time--ignoring his girlfriend.

When we got back to his apartment I was still tired so I slept a little more. His girlfriend had left by now. When I woke up I went to give him his shirt back. I walked to his room and he had nothing but underwear on and had his hand on his penis looking at me like he wanted to have sex. I quickly gave him his shirt back and said I had to go.

He recently broke up with his girlfriend and she is so heart broken but I think she has no idea he is probably actually gay, should I tell her to make her feel better?