Coming from a woman, let me assure you, you have done nothing wrong. One thing with woman, this my not be for all, but for many, though we may not like a person the way they do us, we still want them to want us even though we do not reciprocate those same feelings. It's just seems to me that she is now no longer being chased and she's feeling a little left out in the cold. You have found someone new, and this old girl is starting to feel a little jealous. If I was her, I would have been thinking, "So he says he likes me but yet, one little sign that things may not be going smoothly, he's ready to give up. Am I not worth it then?"
Just like children, they may have a toy and not want it anymore and dont play with it, but as soon as someone else wants this toy, all of a sudden, its their favourite toy..........

I hop it's making sense to you....ITS NOT YOUR FAULT.