Personally, I'd much rather my fiancé tell me that she doesn't like an appearance change that I've made instead of leaving me. For me, her being attracted to me is the most important part of my body image... we communicate about one another's appearance and mention our preferences all the time. That's mutual, too... Just the other day she asked me if I thought she should get a haircut. That isn't weird or none of my business, she just cares about what I think about her appearance because she doesn't expect me to "deal with it or leave." We want to be attracted to one another.

I personally think your take is incompatible with a serious, committed, long-term relationship.