In a tough situation involving my Ex, our daughter, and his new girlfriend. Help..!!!?

Oh wow that's so horrible of them! And I can't believe your ex went and found a new girl just like that... I think you should write his parents a letter explaining your emotional status, and until they understand how you're feeling i don't think they deserve to see their grandchild if they're treating you like that. I think you shouldn't see them until you feel emotionally stable to see your ex, tell them you need space, just tell them exactly how you're feeling like you did above. Best wishes for you and your child xox