Personal info, but I've been inches away from suicide personally. I can say, when someone gets to that point, many times they won't ask for help because they CAN'T. The only solution they see is getting out, I know. Asking for help just isn't thought of when life itself is completely pointless. If it weren't for my best friend and my husband (then fiance), I wouldn't be here. They held on to me, made me get help when I didn't want it, and saved my life.
Those who haven't experienced true suicidal ideations really can't fully understand what its like. A helping hand that won't let go at the worst time is a lifeline. It can be hard to be the anchor for a suicidal person as they see no point in getting help. But when they try to push you away that's when they need you the most. Get them in touch with a professional who understands what they're going through. Sometimes though for those who are alone just having a friend to talk to can make all the difference.