I just lost someone I love to suicide, hurt is unavoidable, but there are a few things I think that could make acceptance a little easier. Currently the main two thoughts that are going through my head are, "I hope he knew that I loved him." "Was there anything more I could've said?"
So, I'd suggest making a point that there was nothing else anyone around you could've done. The main thing for me is unknowing, and it leaves a strong sense of guilt that I hadn't done enough, that I should've tried harder. It's difficult being someone that is also planning on CTB, I know how for me there is nothing anyone could do to help, but it doesn't remove that sense of failure. I'd also say to add that you knew they cared/loved you, and why you chose to CTB. Truth is, even with people around that care, it cannot save you. There are problems we face that are just completely out of anyone's control. Sometimes hurt is too deeply embedded into us, and all the love in the world couldn't change that, and that is just reality of this hellish existence.
Regardless, I wish you luck. Be as honest as possible, and say everything that you can. Much love.