I've just found this thread and wanted to send you love and virtual support.
My dad took his own life after killing my mum when I was six. I was angry, really fucking angry with him for years, as was my sister. Mainly along the lines of how could he be so fucking selfish because he had all these people who loved him and needed him. And it was dreadful for years, his parents, his sister, us - his kids, all richoted between the anger, the tears and the dreadful feelings of guilt and utter sorrow. I am all grown up now, 46, with kids of my own and my own MH issues, ironically complex PTSD which stems from his suicide and he suffered from PTSD himself which probably triggered the murder/suicide in the first place. I guess I can be a bit more understanding now, not entirely sure I can forgive him for destroying my life but I know that at the moment someone decides they can no longer bear the pain of living they aren't thinking of those they will leave behind having to deal with it. They just want it all to stop.
So I understand every emotion you are going through and you need to get it out, work through the stages, talk to counsellors or an organisation who specialises in suicide related deaths. Because it's still taboo. People still say how selfish and they can't understand it. And they don't know what to say to you because it's not cancer or old age.
So be kind to yourself, let it all out, write on here, open a document up and just type if it's too personal for here, cuddle your cat's, take comfort from those supporting you and most importantly, remember the good times, the little things, how he made you feel and how loved you were. Because he did love you. And he would want you to know that.