Quote: So why is it that I don't feel particularly bad?
Because you know that she knows that all you wanted for V-day was sex and you didn't get it so you don't feel particularly guilty for not giving her what she wanted. Thus your interaction falls under the category of understandable but unproductive.
I had an okay V-Day. I wasn't expecting much because my H literally had to work 16 hours yesterday. I made a special cake and a heart-shaped meatloaf and I put two candy hearts in his lunch that said "Good Times" and "I Love You". I decided to get a card too at the last minute. The first card I picked up said "To be my valentine the only thing you have to do is....me!". I cracked up in front of a mob of husbands buying last minute cards, worried for a second that it might be a bit over-appropriate but then thought "WTF" and bought it anyway.
My H brought me a rose and was generally sweet and then fell fast asleep about two minutes after he ate his cake. I was totally cool with this because I am not an unreasonable woman (really it's true) and I wouldn't expect any hypothetical husband I might have to want to have sex after working for 16 hours.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver