What should I say to my friend if she hurts herself because she used to think she was gay?

My friend has always had something that was a bother to her, but she would never tell me what it was. (She’s two years younger than me and is new to my school.) I told her a lot about myself of course, and things that have happened to me in my life. Hoping that she would explain to me, she told me that she tried to cut herself before and that’s what bothered her. But her boyfriend called me and told me that she lied to me, and I needed to find out the truth. So I was talking to her yesterday and she admitted that she lied, and she hated herself for what had happened to her. When she was two years old her uncle made her watch porn, gay porn. She became a homophobic because of this. But after she found out a few years ago she began to cut herself, and do drugs. Soon all of her friends started leaving her, she only had one best friend after this. And she had an urge to hold her friends hand, and want to kiss her, and touch her. But she told herself she wasn’t, and dated this random kid to prove to herself she wasn’t. She still hurts herself over this, and she never came to accept any of this. She never came straight out and told me that she was. She just hates herself, and can’t look at herself. When she looks in a mirror it isn’t her. She told me I was allowed to hate her for this, but I just don’t know what to say to her. I need another persons opinion, I don’t understand if shes homophobic why did she want to kiss her friend? Sorry if this doesn’t make sense, I’m just kind of shocked by this whole story. Please don’t take it as a joke. Thank you for your answers.