If he wants to do something on valentines day - he probably does want some kind of relationship. Maybe more than just sex.
Not because he is feeling romantic and loving but he would be scared NOT to.
Valentine's day is a day when women expect a date/candy/roses/a ring/whatever and if a man does not oblige, he doesn't get to live it down anytime soon.
So romance or mere obligation - Him asking you for a date on V-day is definitely favorable.
Always remember that YOU are the most important person in your world.