I think love is inherently selfish. Death is a difficult thing to face. It can take many years to be ok again when someone you love dies and it can shatter your life in some ways forever.
I think I see good things in people. Reasons they can go on. Problems that can be fixable perhaps in time. I don't feel my particular problems are fixable. So others may not be as well.
I would try to see if there was any hope for anything at all that things could be better or if any love or future would want to be lived if things could be the way they wish. For some people it isn't possible. It's more than a break up, a death, a lost job, failing at school, family problems. I feel if someone wanted, those things can be dealt with. But to have a permanent problem that will forever affect your quality of life. That can never be fixed, changed or overcome what can one do then?
You don't want anyone to suffer or feel the only way out is to die. But sometimes living is worse than non existence. That they ever got to that point is incredibly sad. I would try to support someone in their dreams as much as I could and to provide love if someone confided in me. But if a problem is not fixable how can I say it also isn't ok for them to do that?