Most Helpful Guy
He may have been reaching out to you for a reaction. Perhaps he wants you to ask him why. The answer may be that he never has had a girlfriend on Valentine's day. I would bet that he was hoping for more conversation and you not saying much, have missed the opportunity to open up with this to him. You may be surprised that he would welcome the idea of spending the day with you doing something. If this is the case, he, obviously, will not be very practiced on setting up a special Valentine's day. If you helped with that, just even with ideas, it might be a nice surprise for both of you.
Most Helpful Girl
I don't think it's related. A lot of people don't like Valentine's day, think it's just some commercial celebration. When you're with someone, you don't need that day to show you care or that you love that person.