Alec no longer called out Magnus's name in his sleep, the only name on his tongue was Max. Magnus wasn't exactly jealous, just uneasy. Alec's thoughts seemed to only revolve around Max these days. Magnus couldn't blame him for that, obviously, Max was his only brother. His little brother that he was always told to look out for. The amount of guilt must be phenomenal, considering Alec couldn't get out of bed.
Alec had tried to stay in the institute, but seeing Izzy's face was like a stab to the heart. Hearing his parent's cries late at night made it impossible to sleep. Jace was always out with Clary. He gave an excuse before he left that he couldn't handle all that grief in one building. Alec barely heard him over the sound of his raging thoughts.
Alec started staying with Magnus. Magnus didn't mind taking care of him. He knew the pain of loosing a loved one. Sometimes you just need someone to take care of you. Sometimes being around family is too painful. Magnus understood this and, quite literally, welcomed Alec with open arms.