The best time an ex-girlfriend remembers you, is when you are having a good life, when your life is more comfortable than when she was with you.
The bad time when she remembers you, is when your life is in crumbles, messy , more miserable than when she was with you.
An ex-girlfriend of mine recently remembered me , I don't know what made her call me but it was bad. currently my life is not the way I planned, nothing is happening to me professionally or personally.
So when she called, I made myself seem busy so I could hang up the phone.
When your ex calls you , I know it's bad but you want to be seen you're doing better than when she was with you. or maybe my thinking is wrong.