his baby mama wants him back!

Isra
My man and I have been Together almost 2yrs and he has a child with his ex. His ex has been trying to get back with him and it's annoying me and pissing me off. When her mother told her he was seeing someone she texted him "why did u love me?" She would flash him her body to show him her body after the baby (4 freaking years later!) she'll try to come over at night using the daughter as an excuse and he told me she doesn't pay attention to the daughter. Instead she'll be on her phone the whole time. 
What should I do? I talked to my man and told him he needs to set the boundaries and be bluntly direct with her but Idt he's being as blunt or direct and it's bothering me