Tease

[Tanya Shivari]

A member of the opposite sex, ussualy a [female] who entices you into thinking you have a chance. Almost always ends with you having blueballs and feelings of sorrow, resentment and bitterness.
A girl who works at a local pizza parlor in Berwyn, IL.

[Tina]

A girl who knows shes wanted... but just wants to play with the guys head. ;)

[Becky]

Verb definitions:-

To intentionally say, do or imply something that isnt accurate so as to see whether the object of the teasing believes it to be accurate.

To attempt to induce sexual arousal in an individual without intending to satisfy the arousal. When used in this sense, the word is customarily used to only in reference to women, but nowadays it is sometimes used by women (or gay men) in reference to men. Strictly speaking, this definition of the word is merely an extension of the first definition provided.

To make a sort of a combing motion, with a refining effect.

To extrapolate; to draw wisdom from; to extract.

Noun definition:-
Someone who is known to perform the actions detailed in the first or second verb definitions can be described as a tease.

[Justin Bieber]

Someone who makes you think you guys have something going, but shes just playing with your emotions.