I went through something like this with a friend. Except, I was the one that had done the helping. Yes we both learned from each other. I saw him through some very difficult times. And he started being harsh. It eventually became worse every time. I cut him off because I'd had enough. I felt terrible. Cried about it, too. In time, he validated the reasons why I had to let the friendship go.

I don't think you should feel guilty. If she contacts you, you can respond to say hi, and briefly state what's new. You say you've moved, so, no need to get together, right?

Or you could ignore it too. Either way, hope you feel better about this.