I don't understand why would youngmin ( and their mutual friends ) blame yuhyeon for what ...

I don't understand why would youngmin ( and their mutual friends ) blame yuhyeon for what happend. All he did was let him know that he wasn't comfortable and didn't have any feelings for him in fact youngmin is the guilty and selfish one he made him witness his suicide attempt and keep calling him after all those years so that he won't " forget " about him and move on with his life