I wish I had words to make things right, I don't. I do know there is no timetable on greif, and the more a person means to you the deeper that grief. I was lucky and expected my partner to pass away, it was a straight medical condition. Even so it was a very long time and many things had happened in my life before I could remember good times with her and smile at them, enjoy her sense of humor, as well as the hole that was the loss.
I know what you face is harder, suicide is a special loss, and comes with things to deal with one top of the greif.
For most peole always wondering why, wondering if they could have done something, if the signs were special and obvious this time, but were missed. It can be easy to blame oneself, and at the same time for many there can be anger, resentment and feeling betrayed. Why he should have left me - was I so bad?
I guess the fact you said "as usual" about the police and ambulance may have meant your friend had suicidal thoughts or actions before. Even if htat is the case no one person can keep another alive, it's not possible. It takes a medical team, some help from those around if they can, and a little spark inside the person themselves. Without all of these it does not work.
All these things have no answers, or at least not logical ones.They are things one lives with, and at special times, such as an anniversary come more to the front of the mind. Planning for such events helps.
I guess my way of dealing with grief, once the mind had started to think of things, was to try to live as normal a life as I could. Going to work, supporting those that needed it (even if that just meant sitting beside them as they cried) and trying to look after myself - even if there seemed no point at the time. Exercise, good food, trying for sleep.
If you are lucky like me there may be someone to talk with, someone who cares and does not try to 'fix', just has patience and listens. Is there anyone in your life like that?
There are things you used to enjoy, maybe sport, maybe music, maybe art, anything. They are there to try again. They can come back and be a pleasure and occupation.
I've said enough for one go, lease come back and talk some more