You did nothing wrong, people do change at least GGs do and I know that for a fact. I have been through 2 marriages and countless girlfriends to have them know in the beginning and then a few years down the road want nothing to do with it. My second wife used to help me even before we were married, she even let me wear her Wedding dress on our honeymoon and told me weeks before that she was going to let me.
Something just goes click and the whole world is different. They want nothing to do with it and why can't you be more MAN!!! That is not the way I am, why did they have to change. Is it the fact all of a sudden they realize how many girls clothes we have, or are they afraid we might look better than them. Maybe it's a friend of theirs they told and their friend said to them "Oh you poor Girl, I would never put up with that"
You never know what might have caused it, and you may never know. Things may turn around for you someday and I hope they do, but I know unless you can be her MAN and never go back you will lose her. That is what happened to me countless times. It Sucks, but that is the way it was with me and still is with my current GGLady.