I WAS LOOKING AT MY HAIR in the mirror. “I think I might need a touch-up,” I noted to my husband, Peter. “Hmmm,” Peter replied, without looking up. (Which means, “If you think so honey. I honestly believe you might be able to hold off a week!” I can always count on Peter for a thoughtful response.) “Maybe I should get it done in time for Valentine’s Day.” This time Peter did look up, with just a…