Maniaphobia
Bob was scared he was going crazy. He kept waking up in weird places and having flashes of memories he doesn't remember doing. There was one common thing in all of them, Buddy was always there, but he was dead though? He saw him get pulled into the turbine of that plane.
The memories... They were horrible, disturbing even.
He was chained up in a place he didn't recognise with Buddy screaming at him, only he couldn't make out most of the words, just scattered "You threw the car!" And him laughing angrily "You thought I'd be gone just like that!".
Bob always remembered perfectly what Buddy said last...
"The rest of your life is payment for the one you tried to take away!".
Then he would remember flashes of extreme pain and then awful unwanted pleasure.
Then it would all go black and he'd wake up, his body would have cuts and bruises all over it, but the latest time worried him the most, there was a large 'S' carved into skin over his heart.