Here, I'll give you an answer: nothing. You've given him nothing in return.
Sure, sex. A little affection, a manly shoulder-pat or two. But you've never thought his battles unless it benefited you. You've never dropped everything to save him and you've made it real clear to him that despite everything he's ever done for you, he's never going to be more important to you than Sam.
It's no wonder he offered his vessel up to me when you needed me and Sam refused.