My girlfriend deliberately didn't return the text messages, and then she said, am I angry? What do you mean?

First of all, you have to distinguish whether she didn't see the text message or what she saw today.

We girls sometimes do things that make each other smile in order to test her boyfriend's feelings for herself. But we will never do the same exploratory thing again. Because the second time is meaningless.

If your girlfriend does this many times (more than three times), it must not depend on whether you value her or not, but that she doesn't value you. If so, you should consider whether her feelings for you have changed from other things, and even see if there is a third party involved.

If there is something really wrong with your relationship, talk to her well, and it will be better to solve it as soon as possible. I believe your sincerity can impress her.