"And what could this so crucial thing be?" She asked with an eye roll. "I still have enough time to live and make new memories by the way. Isn't that interesting?" she added and giggled but her smiles were just on the lips.  

An act she decided to put up just in order to hide how she really feels away from him.  

'His pity is not something we need' her mind had said and she accepted it willingly cause she felt with the way he loves her if she shows sadness that it will break him apart and make him blame himself for everything. And someone blaming himself for her...