Girls know that I like her and sometimes tease me. What do you mean?

Girls know that you like each other, so for him, he can only respond to you in a teasing way.

Because now you have a secret crush on each other, you haven't confessed to each other, and the other party knows now, so at this stage, he knows that you are a secret admirer and dares not say it. That's why he teased you. His purpose is to make you have the courage to stand up and confess, so that he can respond to you.

Now, although you are often teased by him, you don't have any courage to stand up and confess. So the other person is a little disappointed in you, and he will continue to tease you at this time.

Therefore, I suggest that you take the time to confess to each other, and it is best to finalize your relationship. Only in this way can you two become formal boyfriend and girlfriend.