I've been on both sides of this. I had a work colleague who committed suicide who was in a similar situation to Paul Green (i.e. was married, had children etc). I had my youngest niece who attempted suicide. I lost a cousin who hanged herself, whilst I myself attempted to take my own life.
One common factor is that when you are troubled, you feel like you would be a "bother/burden" to your family and/or friends which is why you don't talk to them and reach out about your problems. Hence why it is important to make anyone you suspect of having a tough time feel that they are wanted and are free to talk to you about anything, that no matter how frivolous it could appear, that you will give them a sympathetic ear.
The work colleague who did commit suicide, a mutual friend still beats himself up about what happened on that day. He tried to ring him in the morning, but the phone was engaged so he decided to ring back in the afternoon. When he did, the guy was gone. He still thinks about "Had I tried sooner, I may have been able to talk him out of it/help him". He feels massive guilt about some 15 years later. That's probably what some of Paul Green's friends and family are going thru now.
You don't need to pry or force them to talk. Just let them know you are there, you are thinking about them, and that if they ever need to talk about anything that you will listen and not judge.