If you're the guy who's on his path to owning your own shit and being forthright and you've had a decent history of making sure you're prioritizing yourself and your happiness, you're probably going to get accused of wanting an affair.

Assuming you're not already having an affair and assuming you don't really want to have an affair, here is the single easiest way to squash that accusation in the butt.

I love you enough and respect you enough that if I'm going to have an affair, I will be sure that you're the first one to know. I guarantee I'll do you that courtesy. I expect you to do the same. Hopefully though, we don't give each other reasons to have affairs.

and mean it.

If you want to point out the obvious of how you're happier, you feel better about yourself, you're more confident, and you enjoy life more, feel free to do that too. Point out and verbalize the obvious changes that both you and her are noticing, the payoffs of the work you've been putting in.

There's a psychology to how people handle change. People are more comfortable with change when what's changed is made explicit and they're given a reason for it. People like having reasons given for situations they're not sure about.

If you've ever gone through corporate restructuring, management will always give a plausible reason for the cause of any changes to the status quo. Nothing different here.