You and Keith always had something, but it never really happened. There was a few bonding moments then were never acted on. And there was feelings that you both hid. So when you and keith were laying on the ground of a battle field next to each other, heavily injured and delirious. Slowly dying. You were surprised when he said this-

Keith: "if we get out of this I'm marrying you-" He spits out along with some blood coming from his mouth-