Cheyenne was naturally very clear about that matter.
At that time, Charlotte fell in love with a senior in school. And being a young girl, she was extremely infatuated with him and would bring him food and beverages every day. She had given all her gentleness and affection to him.
However, he didn't cherish Charlotte's sincerity and left her hanging. He even wanted her to sleep with him.
Charlotte was nervous and terrified. But in the end, she decided to tell Cheyenne about it and ask for her opinion. Cheyenne told her to turn him down, the main reason being that Cheyenne felt he wasn't trustworthy at all.
As expected, after Charlotte turned him down, that senior soon hooked up with another girl, making Charlotte so heartbroken that she wept for two whole weeks.
While Cheyenne was feeling upset for her sister, she also felt thankful that Charlotte didn't get violated by such scum.