Scars from tomorrow

Alec thinks that he is awake and living happily until he wakes up and Jace informs his Parabatai that Jonathan Christofer Morgensten and Valentine have come back from the dead and missing and have done something terrible to make Alec want to go commit suicide. What is the terrible information Alec had received. Is he dreaming? No. This would be more like a nightmare. What is happening in Alec's life? Is this even his life?