Logan Paul says he was terrified his brother, Jake, would end his life over the incessant hate he got on the internet early in his career ... admitting he and his father were "both legitimately concerned" he was going to die by suicide.
The older Paul bro detailed his fear in the new Netflix doc, "Untold: Jake Paul the Problem Child" ... where he explained the backlash Jake faced after a multitude of controversies had him at an all-time low.
"I mean, both my dad and I felt worried for my brother's life," Logan said.