So basically I think I started hitting it off with a girl we went for a coffee, we were planning another "date" but we couldn't find a time that would fit us both. We texted a lot but since she went away on vacation she went cold, I haven't texted her in a week or so because I'm waiting for her to come back and see if she warms up again, but I'm thinking of sending her a "Happy Valentine's Day" message, just this. Is it a good move? Or will it do more harm than good?
Edit: I'm a 17M she is a 16F and we both go to the same school.