Though Eugene expected to be treated like something less than human when he arrived at the Sanctuary, the exact opposite happened.
It’s everything that the lie-telling Southerner has wanted out of life, and after Abraham’s death dropped him back into a non-winning mindset, it’s the kind of life that Eugene probably never expected to see.
It’s the kind of life that has seemingly made him give up his own identity, the very identity that made him so important within the Sanctuary to begin with.
As opposed to Negan’s plan to suffer Dwight into submission, Eugene is given the Cloud Nine route, complete with big compliments and a lush room and important tasks to accomplish.