Am I in my feelings to much?

So my SO still has contact with his ex. Even though now she's supposedly gay. She has a daughter that is not my SO. But they were close & he's the only father figure she knows. She's 6yrs old. She still calls well only  around Christmas time or when she wants something. I have told him that he needs to cut that communication off especially knowing the fact that we're having our family of our own & if he truly loves me like he says he does.