What are friends for?

SITUATION: A friend is upset.
DURATION: More than just a few days.
ACTION TAKEN: Tried to comfort, but to no avail.

So... do you leave a friend behind knowing they are troubled but doesn't feel like talking to you? Or perhaps because you couldn't do anything to help and you leave them to stand up again? Maybe you feel that you are being irritating to your friend because you've been trying to help but always being rejected?

I don't know what to do at all. I wish I could help in some way or another. But I seriously have no idea on what approach to use or do anything that could make that friend feel better than the current situation. If you really care for someone, you would like them to feel happy and all. And it really sucks seeing that friend being so down all the time.

I don't have many friends to begin with. Not many that I could communicate with very well. Probably because I'm a weird guy, I don't mix well with others, or whatever reasons there may be. But when it comes to people whom I really care for, they do mean a lot to me. I really hope that I could be a friend indeed when that friend is in need.

Take care.