What do you mean by texting girls and not returning them?

First of all, it depends on the relationship between this girl and you.

If it's a normal relationship (such as classmates and colleagues), it's normal for you to post something that has nothing to do with what you intersect. People don't like you very much, and things don't matter. I won't reply to you naturally.

Then there is friendship. Maybe it's because you did something that made them angry, or they were depressed and didn't want to go back.

Interpersonal relationship. The first one may be the same as above. The second is that this girl wants to be your friend or even a normal person. In short, I'm not interested in you.

In addition, communication providers, mobile phones or other factors that cannot be solved are not excluded.