Describe Melinda and Rachel written conversation in the library? Why does Rachel behave like does?

Melinda decides that she has to talk to Rachel about Andy Evans. She follows her to the library after English class and sits next to her. Melinda begins a conversation with her and they soon turn to the topic of Andy. When the librarian tells the girls to be quiet, Melinda continues the conversation on a notebook. She asks Rachel if she is still angry with her. When Rachel says that it was stupid of Melinda to call the police, Melinda tells her she was raped. Rachel is concerned until Melinda names Andy Evans the perpetrator. Rachel springs out of her chair, calls Melinda a jealous liar, and leaves the library.

Rachel behaves like this because Andy is her boyfriend at the time.