My boyfriends mom hates me

I have talked to this kid from my school for over a month now and have both decided we would like to advance our relationship further, but one problem is his MOM. His mom has hated me from the minute we’ve started talking because he failed to tell me that his mom reads our text messages, so now she thinks I’m a slut. :/ she refuses to let us hang out because she is trying to “protect him” we are both 17 years old and our trying to figure out ways we can hang out. He would like me to text his mom and “explain everything to her and my intentions” but I have no idea what I should say to her. I need help! Plz give me suggestions and ideas of what I should even say. I really don’t even know where to start