First, let me reassure you that at 140 down from 180, you certainly ARE smaller, not matter how it feels sometimes. You've done good work.
And your fella thinks you're sexy because you ARE sexy to him.
And a friend once told me that even though there's a big deal made of women and perfect bodies, that once the clothes are off the guys so don't care. They're naked and you're naked and that's the way they like it.
Congrats on your loss!