I'm really worried about my friend... suicide? Advise please?

My good friend just shot himself the other day I still can't believe it. I just wish I went the distance when he said some things that I really didn't take seriously. This guy was funny but now I think it was just a mask for all of his misery.Listen to your friend,tell your mother about this she may be able to help out more than you think. Nothing is worth killing yourself over. My cousin put a shotgun in his mouth a few years ago because he was upset that his mother was interfering with his life.Just tell your friend it is not worth it, 3 years(36 months)from now she will be eighteen and she can get away from her mother.