A strong, confident man would be happy someone else improved themselves. Your W has lost weight, improved her health and is improving her self-esteem and self-confidence. But instead you are jealous and angry because you are stuck.
Your W would never tell you that she is moving on. She knows you can't handle it. She's tired of that. It's unattractive and boring.
How long has she been telling you she wants out? She wants the house sold and the ties to be severed. What is it you are holding on to so dearly? Why are you afraid of letting her go?
"What is best for my kids is best for me" Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712