Well it's expected that mama bear will protect baby bear. You're a mom. You would do anything to protect him.
It's pretty clear he doesn't want to spend thanksgiving with you...and that's ok. He has a lot of crap going on (consequences for his actions) and this is an excellent time for you to show you are detached and not there to hold him up and coddle him through it.
It says a lot when he broke it off with the other girl so she not "get in trouble" (which in turn is hurt) yet he openly hurt you. This person is not your husband. Detach, step back, focus on you and your baby and let him deal with his monkeys in his circus.
34, xw33 M-10, T-18 2D (8 and 5) Ilybinilwy-1/16 EA/PA- 7/15-present (with my former best friend) Trial apartment-2/16 (also when she considers us separated) W moved out-8/16 W Filed 11/21/16 D final 1/30/17