I have two buddies who recently got fit. One cat, you can see the confidence, he's dressing better, more upbeat...etc.

The other...THAT dude. Posting CrossFit WODs everyday, mirror selfies, humblebrags, every topic includes him talking about being "off that sugar"...you know...THAT dude.

You'll never be able to manage how people feel about themselves in relation to your fitness. Just do your thing. People will notice and respond to the new you accordingly without you drawing attention to it.

...Last night my wife said jokingly ... "don't do too much, that's the first sign of cheating"...

...now that is a potential trap... Your only response to that should be "Naaah..." and keep it moving.