Boyfriend upset his daughter told me she was raped

Okay guys. So some of you know how my first post about this guy was him having 4 different kids from 4 different women and having custody of all of them. If anyone had read my other post you know I accidentally met his kids and it's been interesting. I know how he got custody of all his kids except his 14 year old Maddie. Until today. I was teaching Maddie make up trick and she said she wishes she had a mom to do that for her. I said I'm happy to help. She then told me her mom doesn't see her because she's mad and Maddie told me her step dad raped her when she was 7. and her mom took his said because he said Maddie came on to him. My boyfriend heard and came into the room and said "Maddie what did I tell you about telling people that!You talk about that with family and your therapist! That's it!" Maddie got upset and walked out her room. I told him he didn't have to yell at her and he said Maddie has issues with oversharing and trusting easily. She had told anyone who would listen she was raped and in the 6th grade her best friend told everyone she was a slut who fucks her step dad. She was bullied so bad he pulled her out of that school. He said he cares about me a lot and wants us to work out so bad but I haven't been around a lot and the last thing Maddie needs is someone else who knows her trauma to leave her life again...

Edit: He did apologize for yelling at her and they made up. I do understand his pov