Pretty obvious she still matters.Move on.
My advice is to find the hottest girl you can, preferably younger than you ex. If you know things your ex hates about herself, try to find those features she wishes she had in the new girlfriend. Plaster pics of you together on social media for her to see but with little detail.
Above all things, always make her think she doesn't matter any more.
She will quit, then take half of his pension, or 401k..
In the olden days, lateral relationships were allowed.
But not supervisor hourly. If the sup is married, and you divorced her, good job. Only a skank does that.
If you want a divorce get one, before you cheat, cheating is so damn hurtful.