I dunno if the rest of you have finished COFA so SPOILER (just in case)
Let's talk about how real their relationship is compared to the toxicness of Clary and Jace. Personally in all the books, when ever Alec and Magnus fight it is realistic, like what normal couples go through. They are always honest with each other, and work through their issues (with some pouting from Alec) and come to a decent conclusion.
Unlike Jace and Clary which take 3 books to work out their problems, just to dance the fight tango again....I dunno I just found the comparison interesting.