1. Saved her from the car accident
2. Damon danced with Elena so she wouldn't be embarrassed
3. Damon warned Isabel to leave or he will kill her
4. Damon went with to Isabel's work place to help her find about Katherine's past, and learn more about what's she's planning.
5. Damon saved her life by blocking the arrow.
6. Damon torched mason to get as information as he can to protect Elena
7. Damon tried to kill Katherine
8. Damon sealed Katherine in the tomb
9. Damon "killed" Elijah and saved Elena
10. Damon went with rose to find out more about how to stop the sacrifice
11. Damon went to get Elena back...