I'm thinking of canceling Valentine's Day because my girlfriend looked at some guy.
How would cancelling Valentine's Day make things better?
It won't, but I also don't feel like having a celebratory mood with her.
I understand that you may have felt a little hurt when you thought your gf was looking at another guy, but cancelling Valentine's Day over a trivial matter like this is petty. Have confidence in yourself and trust that your gf loves you, then go out for a nice Valentine's dinner.
I don't trust her and it's not that trivial.
It is. If her looking at a guy is this serious for you, then it is petty. Cancelling plans over that is terrible.