Dude, she is toying with you, teasing you.
Using you to boost her ego and esteem.
This is just sad.
She is engaged, and worried about her ability to still control men, so she basically teases you to prove this to herself.
Trust me, I have seen this with hundreds if not thousands of guys, and I teach men how to pickup and seduce women (among other things that I do).
Yes, this may be cool, it may just be playing. And you know, honest flirting is fun and healthy. But if you are stressing then its NOT cool, she is playing you, and this will eat away at your self respect.
Just the way you talk about this shows how IMPORTANT this is to you - its driving you nuts.
Make a choice.
Make a move, or move on.
The way to handle this is, ... back off a bit. Don't respond AS much. Play that angle. Be busy, whatever.
Especially do this if the situation is such that you cannot really take advantage of the situation.
Then work the situation so that you ARE in a place with her where something could actually happen.
Let’s face it - you are not going to eat her out at work.
Play harder to get, a bit.
Get her somewhere sorta private (not at work, duh).
And then when she tries anything, tries talking, back off a bit and say "you know.... this is cool if ... if ...If ... IF... you are ready to do something about it .....". Then shut up.
If she questions you say "This is not high school, I will fool around, but I wont play games. The question is .... are you teasing like the little school girl, or are you really flirting .. like a woman .. a woman who can take action."
Then see what happens.
If she freaks, she was just playing with you.
Chicks do that, just as a mind game.
Call her on it.
Trust me, hundreds of students, thousands of customers, I know what I speak of.
Call her on it, when you are in a time and place with her for action to occur.
Gene Simmons, the bassist from Kiss, had a great line he used. Obviously this guy has been with thousands of women. He encountered some young chick who was "teasing" - meaning chances are that despite the flirting, she had no real intention of following through. When he sensed this, he told her "Dont start sopmething with me you arent prepared to finish, little girl."
That shut her up very quickly.
Dont let yourself be teased. Yes yes yes (before some uptight woman responds) teasing CAN be fun, but after a certain point, its gets old.