Colby grew up in Idaho and spent years in the Army. He knows all about the compromises you make with yourself in the dark, and he recognizes them when he sees Don making them.
Don closes his eyes when he touches Colby, and his fingers hover like Colby's skin will burn him. But Don keeps coming back, and Colby recognizes the longing, the hunger that's not satisfied, that never can be.
There's relief in Don's eyes these days when he looks at Charlie, and Colby thinks there are, by definition, worse things to be than the lesser of two evils.