First, you need to define, tried to kill oneself?
Sadly, most of the poor folks who do want to kill themselves, well...they kill themselves. They normally don't call someone. It would also seem that if someone, for whatever reason, has decided that they are going to kill themselves, it may well be impossible to stop them.
Most of what is seen in the emergency rooms and most of what emergency services sees....and other folks in the community, counselors, fire fighters/paramedics, police and so on....at best are gestures. My small dictionary says in part, a gesture is...something said or done for its effect on the attitude of others.
We often say, So and so tried to kill themselves. It's a cry for help. Well, it might be, but it's most likely a cry to manipulate? What are you talking about? Good question.
Normally, the person who makes a gesture wants to bring attention to themselves. They want folks to know that everything isn't going like they'd like. Someone can be extremely depressed and this is their way of letting people know. Some people sadly, learn that a gesture is a way of getting attention and they do it over and over. That they do.
Many folks do it to try to manipulate. There's something in their environment that they want to change. Most likely 60/70% of gestures have a boy friend or girl friend element to it.
So and so just broke up and this is their way of trying to get the person back.
Sometimes the gestures are the equivalent of a magician's misdirection. Yes, the person is trying to move the focus from one place to another. As an example, let's say Fred, on the way home with his pay check, decided to blow it on crack. So, he gets home and his wife or girl friend is rightly...well, mad and so on. Sooooo, attempting to move his wife's ire from his bad behavior, he claims he's suicidal, rushes to an emergency room, lays up on a gurney, and hopes his wife will come by and feel sorry for him. And, so it goes.....