They're getting frustrating...
When will those two finally talk and admit that they are NOT doing well instead of pretending otherwise "not to worry the other" and give the exact opposite result?
Sam for hell's sake, stop tiptoeing on eggshells, grow a pair, shake your man, and tell him a blind man could tell he's overexerting himself and that you're worried!!
Tell him that you're bored, that you need to go back to your studies, that you need to define a work/life schedule!!