I'll bring in some age and wisdom here.

First cut out having sex with the girl. That is NOT good in this situation. Not to mention safe. If there is another that she is torn with, she is probably doing the deed with him as well. That isn't cool. IF you continue to keep seeing her, I'd make it a regular, platonic relationship where you guys can hang out and talk and just be together without being "together."

I personally think you should cut out all contact with the girl and tell her to call you when she is ready. Although these may not be games to her, they are still games. Mind games. If you're thinking about being in a committed relationship with someone, then you don't need that. Let her know you love her and that you want for both of you to have a relationship, but you want a relationship that is steady and not just on-again/off again. Once you cut off all contact, that's really going to make her think. Right now, she has the best of both worlds so she isn't pressured into a decision.

If she doesn't know what she wants, then she needs to be by herself so she can figure it out. If she wants you, she'll discover that at this time.

Hope that helps. Later, QD.