Quote from : Welcome to Shadowhunter Academy Book

Once you Ascend, you'll get all your memories back!" Isabelle shouted at him. "If I Ascend, it will be in two years. I'm not going to be the same guy in two years, even if I do get all the memories back, because there will be so many other memories. You're not going to be the same girl. I know you believed in me, Isabelle, I know you believed because you--you cared about him. That means more than I can tell you. But, Isabelle, Isabelle, it isn't fair of me to take advantage of your belief. It isn't fair to keep you waiting for him, when he isn't ever coming back.