My boss went through a personal crisis and I spent the last 18 months in my role going into work, not sure if he was going to turn up etc. As his responsibilities were moved elsewhere I literally had nothing to do all day. I asked to go part time, transfer departments etc but was refused, as as was redundancy, so in the end decided to leave as it was soul destroying. Have had a nice few months off. Problem is how do I explain this at interviews when they ask why I left my old job?