Losing a loved one is hard, I've felt suicidal many times, but you've got to see the full picture, it's just one dead friend, yes, I know it's sad, and you'll feel miserable for maybe days, weeks, months or even years, but you've got to move on, thus it's just a hard bump in the road, but you'll get through it if you don't give up.
What I'm trying to say is that, sure, it's hard and depressing, but it's no reason to stop trying, it's a big obstacle, but it's not a dead end.