Scarlet, of course you are more than just a paycheck to her. It's clear that she really cares about you. However, if she thought you were switching to once a week for a considerable stretch of time, it does make sense that she would put someone in your regular time slot rather than holding it open. I understand that it hurts, and I'm sure I'd be feeling the same way in your place (I have general times that T holds for me but not an official spot). But please try to focus on the fact that she's making time to fit you in. That is a sign that she cares. Hopefully you will be able to get a regular second spot soon (if not the same one). But for now, she's finding time for you. And that means you are important to her.