I'm going to talk about suicide to the girl who rejected me
Why? do you feel suicidal?
I just want someone to listen when I talk about it.
That's probably not the right time to talk about that. You should talk about that with the right people, not just to guilt trip someone.
But she refuses to talk to me when I talk about it.
She has her own thing going on and she might not feel equipped to help you with something so serious. Please try talking to a professional or they have anonymous hotlines you can talk to someone trained.