If you haven’t had a gross girl approach you, rehearse your escape-rope beforehand so you don’t crush her feelings (while you CAN, realize that you might be creating landmines for you at work with a crappy let-down)
My fave is making infrequent reference to an ex “I’m in this weird thing with, and it’s like, ugh, so aggravating, but I just can’t move ON, and it’s like….argh”. Then you can say “aww I would but….” and act like you’re still in a holding pattern w/ some ex.