Sick to the Core (Malec/Mortal Instruments fanfic)

(Takes place after CoLS) Magnus has just dumped Alec and now the shadowhunter has begun to question his place on earth. He feels unloved, depressed, upset, angry at himself, all the while Magnus refusing to help because he claims it to be Alec's fault. What happens now that Alec has given up fighting? Can their relationship ever be fixed? (Warning: major feels to be expected!)