Well, love is to be renewed everyday, every hour, almost everysecond. It's as important as breathing, when you can freely share it.
Everyday is Valentine's day, when you share love. So chosing february 14 bears almost no meaning.
Your post lets me think you did play your role, your gf also did... but you feel there's something wrong doing so.

Valentine's day is even better, when right before coming back home, you suddenly want to suprise the one you love and think of something simple (or not) and share it. You might sometimes get mild reaction, after all it might have been a bad day for the other party, or get a nice reaction, or a great suprise. But when you have time, you can try a lot