1. Your H is just spewing Wayward Script and your in laws. You need to prep them for that.. Show them Divorce Remedy and how close what your H is saying is to the Scirpt in the book.
I will look up the page numbers in DR for you, but MWD explicitly says to ignore it and that what he SAYs is merely an indication of how emotional he is right now. It cannot be taken LITERALLY.
I mean seriously, he says to his parents you two are just friends, but he likely didn't mention he's having sex with you now did he? DO you think he skippped that part?
If he didn't mention that, hes lying to his parents and THEY dont' have an informed postition.. so you can ignore any of THEIR conclusions.
2. You need to as was said, calm down and NOT let his WORDS affect you. Monitor what he's DOING ONLY.