Do you know for a fact that he recognizes Valentines day as a "thing"?

You say last year you were with someone else, so this is your first VDay together... I'm guessing if he's generally not the thoughtless type that he probably doesn't celebrate it
and if you 2 haven't spoken about it, he may have assumed you don't, just like you may have assumed he does.....

I don't do the VDay thing, and apparantly its not uncommon.

Either way, whether he does celebrate or if you're not sure, I agree with the idea that you text him a Happy VDay message and take it from there.