I have a Married female co-worker who is very flirtatious with me, when I flirt back she gets mad? Huh?

Dude you are being played, if she,s your boss go along with it but don,t respond back as you have been just let it go. If she is not your boss, tell her to go **** with the guy who delivers the mail, as you don't roll that ****** way. Women (no offense ladies) are here just to **** with your head, she is certainly ******* with yours.