UHM how do i tell my mom???

okay guys so i know its like bad to get with your ex and whatever whatever BUT i did get back with mine RIGHT but the thing is my mom doesn't know and she kinda doesn't like him.....SO i need advice on how to tell her... side note he texted her but she didnt answer... soo igz im also waiting for her to bring that up??? butt other then that updates will be made.