It's not just that Damon would've rather died than killing Jeremy, but Jeremy also couldn't kill Damon. Ugh, I can't
THEY’RE THE NEW TEAM BADASS.
Jer was bad mouthing Damon in the beginning of the episode saying how Elena was foolish to trust him and then for him not to be able to kill Damon when the chance came, when Damon was compelled to kill him, it made my heart hurt. Jeremy see’s Damon as an older brother. They used to play video games together. He kept him safe. And when he realized that Damon had no intention of willingly hurting him, it just reminded him of all that. Sure, Damon barked orders and did things a little unconventionally, and he was dating his sister, but when the time came, Damon did everything he could to make sure Jeremy made it out alive- including taking on an Original.