Something I've noticed with multiple women in the past. Perhaps this is merely my own experiences, but it seems to be a pattern. They always seem to expect you to talk to them while you're at work, you know doing like actual adult things, yet whenever you're free they'll disappear. So you lose interest and move on, then like clockwork they'll reappear when you're busy.

It's almost as if they thrive on stress. They want you to stress out and talk to them when you can't, they want you to make last minute plans to see them, and when it becomes convenient for you and you actually have time for them they're no longer interested.