Would it be okay to refuse to go to my sponsor's funeral because he died of a relapse and overdose?
Why don't you want to go to your sponsor's funeral?
Because he really let me down when he relapsed and I don't think I can forgive him for that.
I'm sure this is very difficult for you, but you should pay your respects to your sponsor and his family. It's unfortunate that he relapsed but you should not hold that against him and his family. You should go to the funeral and pay your respects.
I care about him but I have to show it doesn't matter. I'm going to be his bad example.
How someone passes away shouldn't be the reason you don't want to attend their funeral. Remember the good with the bad and try to overcome your worry. Let them know you cared by showing up for a little while.