How do you deal with your boyfriends rude vindictive babys moma?

she constantly tries to make me jealous lies she cusses at him every chance she gets, and we are supposed to just act like every thing is fine and dandy i have kept a stiff upper lip with her but i lost my cool with her and we got into it verbally. i have never interfered but she made comments about me which is none of her business because they arent together anymore. how do i tell my man to tell his psycho baby moma to cool it or im gone