I did call time on the relationship after a couple of months. It sucked, but we simply didn't connect. By the time it ended, the "hangover" had gone, but I still couldn't really muster any passion for this girl and, for both of our sakes, I had to end it. I am, however, now very happy with someone who I have an immense amount of passion and love for and my head is completely clear. Thanks for everyone's comments and observations. Even if I didn't particularly agree with some of them, they made me think.