Don't feel bad ray, there was very little you could have done, just being a friend, being there, was more than enough.
I know there are a few of us on AB that have experienced this most terrible of illnesses - and that's just what it is, an illness. Clinical depression is an illness the same as Measles is, except there is nothing to see. I had it for over 20 years, probably triggered off by an advanced miscarriage, but whatever the reason it was a living hell. The only way I can describe it is that when you are speaking to anyone, even loved ones, you feel as though you're not really there, there's no connection. Even on the sunniest summer day you see only blackness and feel incredible fear.
Suicide, oh yes, you just want to end it all, there is no thought of anything except the desire for peace. Everyone thought I was a funloving, bubbly girl. No, don't feel any guilt ray, there's no need. You sound a really lovely man, by the way.