I've heard that no one attempts suicide twice, but guns make it more likely that their first attempt succeeds
>And for those who did not die, it's likely they would not try to commit suicide again. A 2002 review of 90 studies indicates that more than 90 percent of people who survive a suicide attempt won’t die from a later suicide attempt either.
Lots of people attempt suicide more than once, and many of them die by suicide when they try again.