Just sending a hug to you and your son. Sorry you're experiencing this (again). I like Lexie's suggestion of a polite, factual note. Maybe tuck the note into a copy of Why Does He Do That?, because this exact scenario is presented in the first chapter of the book. The well-meaning new gf gets hooked in with a sob story and starts crusading to help her poor, beleaguered new love win back the love of his child(ren) from the vindictive, mentally unstable harpy who stole them away by lying about him being abusive. Ugh. What a s---show.