his father didn't meet with him to see this discovery, Toya broke down emotionally and lost control of his flames, which nearly burned him to death Toya psychologically broke, taking this action that all he ever was to his father was a failed and discarded attempt at reaching his selfish ambitions. This mental breakdown caused Toya to completely abandon his old self and become Dabi, a murderous and pyromaniacal villain obsessed with killing all villians,you were his best friend he cant rememeber