Yep it has Pagan Origins! The history of Valentine's Day is obscure, and further clouded by various fanciful legends. The holiday's roots are in the ancient Roman festival of Lupercalia, a fertility celebration commemorated annually on February 15. Pope Gelasius I recast this pagan festival as a Christian feast day circa 496, declaring February 14 to be St. Valentine's Day.
Today it has traditionally been a time where many show how much they care about their loved one and for those who may not have had the courage to express their feelings for someone. This can leave lovers anticipating a delivery of flowers, traditionally red roses.
Roses have long been the symbol of love, red being romantic love, white meaning pure love, Yellow meaning jealousy and the list goes on.