When talking to a friend considering suicide, the most appropriate action is to listen carefully to your friend. It's important to provide support and show that you care.
The other options—judging your friend, leaving them alone, and agreeing to keep the talk a secret—are not appropriate responses. Judging can cause your friend to feel more isolated; leaving them alone may increase their feelings of despair; and keeping it a secret can prevent them from getting the help they may need. Instead, encouraging them to seek professional help or talking to someone who can provide support is crucial.