For a person vacillating wildly with emotional extremes (your wife), a person who is centered and doesn't change no matter what she throws at him (you) can be a strong stable influence who helps them find center. I think that if you continue to plod along on your path, she will find that comforting.
A caveat though, for if and when she does start sniffing around. Had a discussion last night with my H. Asked him if he thought there was any chance that men and women could get along if they didn't have sex. Answer was "no, not at all". Got to agree. Without sex, men and women cannot co-exist in the same house.