Why should this sex toy be angry?

[Andrew]

This girl liked me and she wanted to have sex with me. I wasn't interested and I ignored her. I began to develop feelings for her and I was chasing her. I found out that she has friends with befits. She is also a playgirl. She told me we should know each other before a relationship. She seemed to have feelings for me and I asked her out clubbing with me. She wanted to surprise me so she said she was busy. She came but I picked up another girl instead. She found out on facebook. I saw her and she asked if i like the other girl. She was ignoring me for the whole day, the next day she complained about guys using girls for sex. But why is she angry for this, she is a playgirl and she slept with other guys.