Almost 9 months ago, a girl from our school took her own life.
I can't say that I know
exactly how you feel, but I went through something similar.
I believe that you just need to recall the brightest memories of that person and never forget about them, and also to realize that whatever had caused them pain before is gone now because they are at peace. Don't be afraid to release you feelings and thoughts, talk to someone or allow your tears to fall. You don't need to hold it back.
Never feel guilty or responsible for what happened; I don't know what happened in your situation, but the girl who'd passed last year had once been my friend in grade school. We'd drifted, found other people, and seldom talked ever again. The day before it happened, I had--for some reason that I still don't quite understand--taken a moment to just look at her. She didn't show a single clue to what would happen the next day.
The point is though that I blamed myself for not being there for her, not knowing the demons she was fighting within herself. I know now that it was her battles and hers alone. I don't know if I could have saved her, but I know that blaming myself would not bring her back.
Keep your chin up and don't forget to enjoy the big and little things in life. I bet he would've wanted you to.
I've very sorry for your loss, dear, and I wish you the best of luck,
~ Reya heart