Ex wife

What do yall think about this..

Me and my boyfriend are 7 months pregnant, we have been together for almost a year, i met his children twice know whose ages is 11 and 8. The ex wife is married and trys to control my boyfriend with everything or hes not aloud to see his children. Few days ago me and boyfriend went to his parents house to watch the game and to swim, his daughter was their she talks to me, shows me pictures of things like her going on trips with her mom etc. And we all went swimming, that means she got to spend time with her dad, the ex wife called yesterday cussing out my boyfriend and started calling me a whore and so on, and that im not aloud around the children until she gets a paternity test on my child. I dont think thats her place? But correct me if im wrong. I have never tried to take her place, or anything i did respect her until yesterday.