When did this society give you a crisis of trust?

I have just arrived in a company for three months, and I met Sister Li, who is enthusiastic about helping others. In my opinion, she is like my own sister. I always trusted her. That afternoon, she suddenly borrowed 3000 yuan from me, saying that she needed it urgently and would pay me back as soon as her salary was paid next month. I don't think it's anyone else anyway, and I'm not at risk. I lent it to her without hesitation. As a result, after three months, she didn't say a word of money, and she deliberately walked away when she saw me, which made me feel particularly chilling. She is actually a man with a cruel face, and I have a crisis of trust in her.