My best friend just opened up to me about being suicidal

I'm not good at this. I don't always say the comforting things that people want to hear, I tell it how I see it but this is a sensitive subject and he's my best friend and I've been begging him to open up for months now so now that he has, I don't want him to regret it.
Any advice? What can I do or say?
I don't think he'll ever go through with it because he cares way too much about his family but he still has thoughts of not wanting to be here.