I guess I'm just trying to strike a happy balance between demonstrating happiness, contentment and strength ... but not coming across too independent and fierce.
I think you're investing waaayyyyy too much time worrying about how YOU come across to HIM.
Find your "authentic Train," and be HER. Get your mojo back. Do what Train would want to do if her H had suddenly died in a car accident, and she were single again.
Find HER. He's either attracted to that, or he isn't. I suspect he WILL be, but you need to find out what makes YOU happy, and stop trying to please your husband. That's not a healthy thing to do is a HEALTHY marriage, and it's certainly not what you need to be doing when he's screwing around on you.