I can't imagine wanting to end it, but I have a friend who really struggles with life at times. Luckily he has a group of friends who will offer support when he wants it. This can be a tough time if you are on your own, so looking out for those who are alone ought to be a priority.
Thanks for caring.
It can be hard to grasp for people who have not suffered from such feelings. Best I can tell you is keep an eye on the people around you, keep them busy, let them know they are needed.