My friend, again...

Hey guys! I'm looking for some advice from you lovely lot once again! :)I've got a friend who is not too sure if he is straight/bi/gay although he has had sex with a man and enjoyed but not quite the same with a woman. The problem is that he is in massive denial to the point that he blames gay porn (he says he's addicted) for him not being attracted to girls. So now he doesn't masturbate or watch porn so he can clean himself.Recently he's told that he almost had sex with his girlfriend and knowing what I've mentioned above I asked him how did he feel. The answer was the same: he did not feel attracted to her. And then he told me that he actually had quite bad day because he started thinking that he will never get better and he started to panic.Unfortunately, he is not the type of person with who you can talk openly about stuff and I can't really tell him that he's not a teenager anymore and he needs to be mature enough to face the facts. That's why I was thinking of telling him my story. I went through a similar phase of denial. But I don't know if I should interfere in any way or if I should let him be. Especially now when he told me that he almost had sex with his girlfriend (they stopped because they didn't have condoms at hand) and it's probably gonna happen soon.I feel really sorry for him and I'd like to help him but I don't know how. I've always been there for him, whenever he needed someone to talk to, and I've mostly listened until now and tried to understand what he's going through.Thanks! Any advice is greatly appreciated!