I had this issue before surgery. The opposite of your fiancé having it after surgery. I was extremely top heavy, having neck and back pain and felt so uncomfortable and self conscious of how big they were. It felt like two giant bombs on my chest. Clothes didn’t fit right and I was always covering them up. Even if I didn’t have the back and neck pain I still would have had surgery. When I woke up from surgery, I felt a huge weight lifted off my chest, figuratively and literally. I feel so much more confident and I can wear what I want. I am so much happier without such a big chest. I went as small as the doctor could take me and to be as flat as possible. don’t get me wrong I love being a woman but I don’t need a chest to be one. If I had no chest at all, I probably would still be happy. Having breasts doesn’t define you as a woman. You can still be a woman with smaller breasts or without breasts. Its all in your mindset and how you want to perceive life. She should take a few days or so mourn the loss of not having those bigger breasts anymore and move on and say I did this for me so I don’t have pain and discomfort and feel better about myself and while my old breasts have served their purpose and I have had good and bad memories with them, it’s time to embrace my new breasts and make new memories and be the person I am meant to be.