1. When the Memory Demon took Alec’s memory of Jace.
2. When Izzy locked part of herself away for the good of the family.
3. When Clary had to explain to Simon's mom what happened to him.
4. When Clary had to bury Simon.
5. When Jace and Alec fought each other.
6. When Valentine broke the news to Jace and Clary.
7. When Magnus almost gave up on Alec.
8. When Luke told unconscious Jocelyn that they would be together one day.
9. When the poor vampires were betrayed by Simon.
10. When Jace left everyone behind to go with Valentine.
Which Season One Moment Broke Your Heart?
Let us know what you picked and why in the comments below!