I used to be quite bitter about being single myself. Though I found after about 3 years of being single, I really came to understand myself on an emotional level. Sure it was rough at times, but I felt much more ready for someone to be in my life again on a romantic level. There's a lot of inner insight you can gain when you can devote a lot of your focus inwards, rather than outwards. (Though I am not saying to close yourself off completely to others, of course!)
It just so happens that someone has recently come into my life shortly before Valentine's day. Its nothing too serious yet, however, and I honestly feel its just another day today. Even before I had this new girl in my life though, I wasn't dreading Valentine's day. To some it may be a day to show that little bit of extra affection towards someone special, and perhaps some even get carried away with it, but to many it needn't be more than just another day in the life. Don't let yourself get too caught up in the heartbreak.
I don't really know where I'm going with this, I guess I'm echoing what Luke has already said to some degree, because that is some wise shit.
Have a good one friends.