NO CARD. It's not worth the risk of seeming pursuing, and for a let down if he doesn't reciprocate. If it never was that big of a deal anyhow, let it go. Treat it like just another day. I believe the LBSs need to not do anything on VDay. My gosh, we were left, and the WASs are the ones on the fence. They know where we stand a card is just pressure.
If our spouses do something, it's a bonus, but prepare for nothing so you're not disapointed. JMTC
However, I do advocate doing something loving for yourself. Be your own valentine. Give yourself flowers and chocolate.