If you don't have a Valentine, how about stepping out to help an elderly person, sick neighbor, or a residence of mentally challenged people (no, I don't mean us here on BYC!). A grocery store bouquet of carnations isn't that expensive and maybe a flower or two could absolutely make someone's day.
I'm going make some special decorated heart cookies to send to my sister who's single and been out of work for a year because all the computer jobs have gone to India, some to give to our neighbor who looks after our chickens when we go away, and some for an elderly lady I do housework for on Saturdays.
Sometimes it feels even better to give than receive.