<human>: Can you summarize the given text in a few sentences?

I fear that since I have proposed to my fiancé she has grown complacent. I am currently deployed and at the beginning of this deployment she said that she was going to start trying to lose weight. She is around 180 lbs and about 5' 4" to give an idea. I'm not a terribly shallow guy but when she recently told me that she stopped caring about it, and that she think she looks fine the way she is, it was a bit worrying to me. She said that if she gets to 200 lbs she might start caring. Problem is is that I fear I will become less physically attracted to her. I am not in perfect shape either. But I have also been working my butt off to improve myself and she knows this. I don't know how to go about having a conversation with her without sounding like an ass. We are going to be talking about this tomorrow but I don't know how to state my worries.
<bot>: Fear fiancé has grown complacent and no longer cares about her appearance. How do I talk to her about this?