upon discovering your girlfriend has a twin

I have just stumbled upon an amazing and slightly disturbing discovery. My girlfriend has a twin. Not like an evil twin, but one that is almost exactly the same as her, even in personality (aka MIND TWIN!!), which may be worse because they conive and plot together. My suspicions were started when I would see her at one point in the day and she would be wearing one outfit and then I would see her later that night and she would be wearing a totally different one. She also changes her mind about stuff all the time. And also I believe this is why I think I tell her somthing and she says I didn't really tell her which I just accepted as me having poor communitcation skills which appearently is just simple not true, ITS THE TWIN!(now thats just mean makeing me think that about myself) I confronted her about it and she said yes I caught them...very sneaky liz and....liz 2, but the jig is up. I have exposed your plot to take over the world via ....twin..dom......So what do you do when you discover your girlfriend has a twin? Ask them to go out with you both at the same time, cause seriously then you would totally look like the biggest stud known to man......