Simon always looked out for you. Hell, he basically watched you 24/7. Not like you knew anyway. He always made sure to check in on you. Which made him so mad when you risked your life on that mission. Defusing a bomb while it was about to go off. You got it defused in time, but if you didn't, you would of died.

So here you two are, arguing in his room because of that mission. He was angry. Angry at you because he loved you. He couldn't lose you.

"How could you be so careless and reckless?!"