Sorry about your disappointment. I'm guessing you're in Highschool or so. If he acts oblivious, he's either nervous or just not interested, probably the latter. Try not to take this (or ANYTHING that people do) personally. If you put yourself out there and are nice, some cute boy will appreciate you.
For the first time ever, I was seeing a woman who told me "Happy Valentine's day!". It felt weirdly.... appropriate. Even when I was seeing other people, VDay was always a dumb holiday they never cared about or wished me a happy one.