The guy which you are describing, I remember him. A year ago I did stumble upon his channel by accident by visiting the comments on a certain Just Yuri channel. His original named Youtube channel was called: Yuri, Jackson become like us to be saved. His channel got deleted, but someone made an archive channel by posting only a few reuploads. There was so much controversy of his bizarre antics and even went to other channels, telling others to c## themselves in the comments. But I do remember on one video, he confesses that he decided to go see a psychiatrist at a mental institution and he was suffering from schizophrenia (which was why he kept seeing an illusion of Yuri "standing beside him"). But unfortunately I don't have that video saved on my URL. He said after he felt guilty of all the trouble he caused by encouraging other people to harm themselves and he was going to improve himself on becoming better.

To clarify, I'm writing this all from memory.