I want a suicidal friend out of my life
What on earth do you mean you want a suicidal person out of your life? They need your help!
I can't help them they keep threatening and I am at a loss.
I'm sure you are tired of their sob stories, but you being there for them makes you a good person. If you get them out of your life then you will be sorry after they are dead.
There are other people around who were also tired with them, so it's not a big deal.
Suicide is a really big deal, if you cant take the threats anymore please get them professional help. There are hotlines you can call anonymously and they will send someone out to assess them and get them the help they need.