It is better to have loved and lost than not to have loved at all, as the quote goes. This is the biggest load of rubbish ever. Brook took his own life and the pain of losing him does not get any easier with time. I can only imagine what pain he was suffering and why he thought that the best way forward for him was to end his life. I miss him every hour of every day.
Family and friends were there for us and continue to be there for us. Counselling has helped with two different models of therapy being useful which are, affect modulation and eye movement desensitisation and reprocessing (EMDR), which is useful for post-traumatic stress disorders. Other models of counselling may benefit you.
Talking about Brook and encouraging others to talk about Brook has been important, and yes you get into the habit of saying you are "ok" when deep inside you are absolutely crushed.
Acknowledging key milestones like Brook's birthday, Christmas day, because that is the day he died. Realising any birthday over 22, for my son Finn, are key, because Brook never got past 22.
Light a candle and keeping it burning for however long you want.