Why does it seem as if people are upset when I have to stop texting?

I had exchanged numbers with this very sweet girl around my age a few days ago, we’ve been chatting and so far things are going well.

I’m diagnosed with anxiety, and I’m having trouble deciding if the cause of my worries is a big deal or not.

Things are all fine and happy when we text normally, but whenever I need to take some personal time to relax the responses are along the lines of:

—>Okay

—>Bye

Which in my reasoning (which one again, may be flawed because of the anxiety) doesn’t seem like it fits the mood of the previous conversation. Am I the only one who’s thinking like this? I’m really not sure if im overthinking this sort of thing but it’d be relieving to get an outside view. Any responses are greatly appreciated 🙂