A classmate keeps texting me. What should I do if I am bored?

You don't return first, and then TA may ask you why you don't return. Just tell TA that you don't like chatting, and you have other things to do. You said it so bluntly that most people probably won't bother you anymore.

Or if you insist on not coming back, TA will understand that you don't want to talk anymore.

As for your manners ... is that classmate important to you? Classmate? Roommate? Friends? Or something else?

If it is normal, you should think more about your feelings. When you get through this, you can give TA a gift and do other things with her to remedy it. It doesn't matter even if the relationship is light. After all, I just don't chat with such trifles. At most, I won't treat you as a good friend in the future, and the relationship is generally enough.

If it's important ... just bear it.

The above is the normal relationship version.

If TA wants to chase you and you don't like it, give up decisively. But maybe you like TA because you are struggling.

Never been in love, no right to speak.