General

She tells you that she is not ready for a relationship
She says she wants nothing serious
She gives you the "Let's Just Be Friends" speech
She curbs sexual escalation
She constantly seems to be busy when you ask to make plans
When plans are made, they are very vague and easily broken
Her former exes are openly discussed with you
Acts of chivalry and being a gentleman are rejected or shown no appreciation
She expresses her interest in your friends or other people
She tries to set you up with other people
She does not show genuine humor in your jokes
When she describes her ideal man, it is exactly not you
You've never been to her place
She is rude to you
She says she is taken with or without any proof