The girl was very angry with me and ignored me. She didn't delete my WeChat or block me. Why?

She probably doesn't want to hurt your self-esteem, so at least be friends. She shouldn't want to be unhappy. She can give up if she can, but you still can't let go. If you can't be lovers, try to be friends again. I'm sure she will understand you, as long as you don't be too ambiguous with her. Besides, if you have courted her, she tells you that she doesn't like you.