A misty

Isa girl who will be the fallback girl and mistake it for being someone special. A misty believes in the end she will be what a man wants and will remain a constant presence in a guys world even if he is with somebody else. Even tho shes always temporary, she believes she will one day be permanent in a guys life. Shes not above lying and manipulating to make sure that her place and her foot stays firmly in the door of this person. A misty tends to get very fat and will invent physical ailments to get sympathy and back in good graces with whom she seeks the pity from. A misty is nothing to believe in or trust. Shes very believable and can cry on cue to become more convincing. A misty can turn any guy against his girl by making him believe shes not faithful if the girl has her figured out and poses a threat in being exposed for who she really is

There is a Misty at work around here but she is only temporary.
That new girl is a Misty and i didnt give her enough credit.

A lingering Misty becomes a musty problem that needs to be addressed.