Suicide is hard to predict, even for professionals.

If someone presents with just one risk factor, e.g., relationship break-up, act.
If someone shows just one warning sign, e.g., saying ‘I can’t do this anymore’, act.
Asking about suicide won’t put the idea in their head.
It will provide relief and give them a chance to talk and get help.
It is better to ask and be wrong than not ask at all.
Some people think that multiple and seemingly manipulative self-harm behaviours means that the person is just trying to get attention and are not really suicidal.
However, any prior suicidal behaviour or attempts increases the likelihood of eventual dying by suicide.
Take all signs seriously and act immediately.
Most family and friends (75%) do not help due to fear and uncertainty – this is called the Bystander Effect.