Need help about baby mama

Elaina • Mother of 4 living children,2are my husbands,1 is mine and we finally had 1 together. When i was 18 i miscarried a child and 1/23/2015 our son was born sleeping
My husbands ex talks to him alot and always is causing problems and just told him how she loves him and he just ignores her and wont say shit and wont let me say anything to her because he dont wanna risk her taking the kids,what should i do bc im ready to freak out,already told his ass if we get divorced its bc of her.