Why did Kevin Nash leave WWF the first time round?

Nash left the WWF regarding the incident knows as ''MSG''. Scott Hall wrestled Shawn Michaels for the title, at Madison Sqaure Gardens [Hence MSG], once the match finished HHH and Nash entered the ring. They decided to break Kayfabe and ''Hug'' each other and wish each other luck in future prospects. Hall had already planned to leave and go to Bischoffs WCW.

Upon breaking Kayfabe they were both [Nash and Hall] subsequently firedm leaving only HHH and Michaels within the WWF.