My bofriend's Ex

Blue Soul
My boyfriend had a 6 years relationship where he had a baby boy. At the end this girl left him for anothe guy. And now that he is in a relationship with him, she wants him back and leave the guy she is going out with. She tells My boyfriend that 6 years is heavier than 1 month. I know im not stronger than those 6 years but i know im more worth than her. My boyfriend told her , he wants me not her. But she keeps trying and i dont know what to do ? :(