I called her out on it the next Monday and actually included her mom in on the text message - Nice work buddy. Nice work. Sure that made her feel like the whore that she is.
Word of advice that a brother of mine gave me in regard to your son. Make your home a sanctuary. Calm, relaxing, fun and never an argument or fight...which I know is tough. Sooner rather than later he will realize that she is scum and that you are the TRUE parent.
Also when the kid is with her make sure to bring back as many big boobed babes as possible and bang the s out of them.
Funny part is that it didn't seem to bother her? I guess because cheating runs in their family? Her Brother has cheated on his wife multiple times and currently has had a side gf for over a year plus. Her sister-in-law was banging a neighbor a few years ago for 4-5 months. They won't get a divorce because they can't afford it and live in misery. So I guess f'ing around is the norm for them!
That's what I've done. I turned my son's bedroom into his own section of the house. Got him a bed that has a slide. Super hero themed. Adjusted everything and changed the decor in the house. The kitchen is now our art studio. It is still my son's home and the most important thing is that he's happy and comfortable here.