Why am I second choice?

I really dont get boys. I'm a nice girl, I'm not ugly, I'm loyal, I can keep a guy happy, I'm sweet and I dont dress slutty or hang around with other guys. But the guys I like always pick a girl who sleeps around, is unloyal, lies and dresses slutty over me. I'm not a bad person. I think I'm a pretty good girlfriend, so why am I never picked?
Why am I second choice?
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