Why do some girls feel the need to be validated by men?

Xseed
My former friends with benefits would always feel like she needs to make a guy she's met like her. Its weird because I was also one of those men she needed to validate, and the reason it didn't work out with her was because she would constantly seek validation from men she's met at parties and such. This completely turns me off. Actually I am sure that the reason we ended the relation was because she felt that I had validated her and that she didn't need acceptance from me anymore. That i was 'conquered.' We're not together anymore but I still wonder why she does this and why she can't seem to settle for one guy and have it be enough, instead she wastes her time flirting with random men she meets, hooking up with them, get their validation, and move on. I always wondered if she would eventually mature and find that she doesn't need to do this and this life style is very negative for her. Would she? also, she's just recently turned 21
Why do some girls feel the need to be validated by men?
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