Matthew Morrison was preparing to leave ‘Glee’ before Cory Monteith’s death. The 45-year-old actor played teacher Will Schuester in the hit musical series and he has revealed he asked to be written out during season five because he was keen to branch out into movie roles, but TV bosses asked him to stay on after his co-star Cory – who played Finn Hudson – died of a drug overdose in 2013. During an appearance on the ‘And That’s What You REALLY Missed’ podcast, Matthew explained: “I actually was trying to get off the show. In season five, I asked to be off the show, ’cause I was just like, I’m n…