Bruce Prichard spoke about Jimmy Hart leaving WWF in 1993 at the same time that Hulk Hogan did on the latest episode of Something to Wrestle. Here is what Prichard had to say about why Hart left:
“The reason Jimmy left was because in real life he was managing Hulk Hogan. He was helping Hulk out with all of the things that Hulk did outside of wrestling as well as wrestling and what-have-you. So Jimmy was wearing several hats and with Hulk not being in the company anymore, Jimmy couldn’t do both. While they were both in the company at the same time, it was easy for Jimmy to continue to manage Hulk there. Once Hulk left, Hulk wanted him on the other side and that’s where Jimmy wanted to be so more power to him.”
H/t to 411mania.com for the transcription