I really liked this. Loved the way you took us through his entire mood - justifying the whole thing. No self-pity here, but a definite question of WHY? and no answer. Because there is none. It's a situation many folks face every day, as you very rightly point out. Every doctor, nurse, fireman, cop, etc is a superman in his or her own way.
and I hope that everyone of them finds a Lois. Also loved the way that she brought him back from the awful depression.
Great fic. Thanks for sharing!