You can either continue seeing her and settle for a relationship (obviously casual) in which your motivation to keep meeting women may dwindle (why go out and insert yourself into the meatgrinder when you could just go home and fuck fat suzie to get your rocks off).
or... you could tell her to beat it (in a nice way), enjoy the victory you just had, and then continue meeting women until you get laid again.
I haven't settled for the girl I had sex with two times ago I could have easily turned into a FWB but bid her farewell and deleted her number so I wouldn't be tempted to which forced me to go out and meet new girls... it took me 5 weeks before I had sex again and I did the same with that girl.
It depends on what you want, but if you want to fuck super hot girls as fast as possible Chase recommends cutting the ties and going back into the field to sarge until you land the stunner.
Good luck,
-Rob