How can I get rid of my boyfriend's baby momma?

He says he doesn't want her back but she is always sending him sexy pictures of her to his phone. He keeps them instead of deleting them. He doesn't even have a picture of me in his phone or his wallet. She is programmed in his phone under personnel and her picture comes up on his phone when she calls. I told him that I under stand they have kids together, but this isn't about the kids. This little stuff between them has been going on for three years. I love him, I just want it to stop. STRESSED OUT
How can I get rid of my boyfriend's baby momma?
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