A difficult question about male & female attitudes.

I have spent several days being part of a support group for a girl whose husband has just left her because she had a voluntary mastectomy after two cancer scares. Her family has a very strong history of breast cancer death and she decided to ensure her health by choosing mastectomy. Her husband told her that he did not want to face the rest of his life having sex with a breastless woman and that he would leave her if she went ahead. She did and he left her. My inital reaction was outrage, but having calmed down, is he really that wrong? They are in their twenties and she was very attractive before. She will be again, but not as sexy I suppose.