How much patience is enough?

I've known this woman for the 3 years of which we started off as friends and now are casually dating without an official commitment. We spend most of our waking hours together, at work and at each others places. We act like a couple, with one little hiccup, she has/is entertaining an online bf, she tells me she's going to break it off, but hasn't. When confronted about it she uses the "we're not a couple" defense. I have remained exclusive to her and turned other relationship possibilities away so I don't jeopardize what we have.

If it weren't for the fact she is my best friend and lover (and as corny as that sounds, we are both actually best friends), I would have told her where to go and, how to get there, however she is, and there lies the difficulty.

So simply put, I'm looking for opinions on whether or not to end this.

How much patience is enough?
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