How would you help someone who’s trying to kill themselves?

I’m sorry I can’t break anonymity but there’s someone on a social media site that is going through a tough time and they want to end their life. They don’t want to let anyone know irl as they’re afraid of their family or friends being sad and they want to secretly end their life without anyone knowing about it. <br>They asked me to help them. I don’t know what to do in help them. I know I shouldn’t tell anyone irl but I feel like I’m obligated to do something but I don’t know what to do. I want to help them but irl I’m not allowed to do that, so I feel like I’m in this tight spot. <br>I know I’m help their problems but I can’t help them die. But I feel responsible as they asked helped me in the past. But I don’t think I can break their trust and I don’t know if they’ll do it if I say anything to anyone else.