My friend isn't doing so well, he needs cheering up, badly and some help.. Is there anything I can do? (he's depressed and pondering suicide.. I can't lose anyone else.. Please.)

It's depression and you can't really help something like that... Show him you support him and that you'll always be there. ♡

Depression can be terrible for the person experiencing it. Most people have issues now and then with the "blues" but diagnosed depression is serious. Telling someone to "suck it up" or "get over it" isn't going to work. Some things that can help.....friendship, give your friend your "ear" listen without judgement, encourage your friend to see his/her doctor, medication can be very helpful with someone with depression, exercise....work out with your friend, or take a simple walk. Good luck!

If you're really afraid he's suicidal then call the Suicide Prevention hotline they can tell you how to handle this. 

You can't just cheer him up it won't work, he's depressed and needs medical help.  Try to get him to call the helpline but if he won't then you call and they can put you in touch with the right people.  You can't deal with this on your own.

The only thing you can do is go to him , hold him and tell him straight into the eye that why is he thinking such idiotic things an drag the doesn't care for anyone and is trying to kill himself , make him realise  who all are there for him , me him feel guilt and bad , Remus him his dreams and that life is so precious , and he has only one, tell him if he died then he will be the biggest cheater to all who care for him!