Amanda,
It strikes me that what she is saying has to do with her self esteem. Perhaps even before she met you she worried about being truly loved. When you two got together, she may have thought that that was put to rest in a way she had always pictured. Now, things are upsetting that equilibrium for her. I would say, don't panic. Be understanding and give her time to adjust. I have stayed with my wife. She had a process of adjustment. Now she wouldn't want my previous incarnation back for any amount of money. If she can be flexible with the new situation, given time, she will probably love the changes she sees. You will be happier with yourself, probably more understanding, more loving and be a better partner than she knew was possible. Don't give in to being negative.
Moni