I don't really have much commentary, so I'll put this here: nobody is really de_d when they leave this plane, they are only de_d when they are truly forgotten.
So, keep your memories of your friend, the good times, the bad... and they will always stay alive, maybe not in this plane, but in your heart.
I'm sorry for your loss. I understand how it must feel. Just remember though, even though you can't see them now, they're still with you. Always watching over you. If something small makes your day, that could be them. Anyways, hope you recover from grief! But also know this. Don't rush it. Rushing it will make the pain worse.