<human>: Could you distill the essence of the text into 1-3 sentences?

Last night my fiance asked me if her breasts were the biggest that I could ever like, and if bigger or smaller would be a deal breaker for me if I ever dated anyone if something happened to her. I knew this question was going to cause problems, but in the interest of being honest I told her that I thought her breasts (C's) were perfect, but that smaller or bigger wouldn't be preferred but wouldn't be unattractive or a deal breaker to me. 

Now she's mad at me and is saying that hers should be the biggest that I should ever want and wants to know how I could think that. 

I don't know what to do, this isn't the first time that her insecurities have caused problems between us, I just want her to know that she's perfect and I wouldn't change a thing about her.
<bot>: Fiance is mad that I don't find breasts larger than hers unattractive and I don't now how to make things right.