While I'm sure video games aren't relevant to this point, I would suggest and hope you know not to let that attitude bleed over into more important things. Always maintain the impression that you're way better than her in just about everything and anything she appears to be better at in the moment is just you toying with her. Again, not talking about video games exactly, but in general. The second a woman begins to suspect she's on your level or above it in any real way, the attraction starts to dry up and the "is he really the best I can get?" thoughts start percolating. Never allow her to think for a moment she's anything but the reacher and you're the settler. As soon as she thinks she's settled for you, you're on the way out while she looks for a higher branch. And no, marriage vows will do absolutely nothing to prevent this.