What Do You Think?

I’ve always had issues with my family but when I met my boyfriend 4 years ago.. he became my safe haven & the situations pushed me closer to him and away from them and i was with him everyday to the point we ended up moving in together. Fast forward to my last week being pregnant, me and him were on really bad terms and i felt so alone so i called my mom to get me so i could go over her house and see my siblings and niece. Tonight I accidentally told him when talking about my niece (I wasn’t hiding it) but i didn’t feel the need to jump around it and he asked a question and i said “because i went over there when we weren’t talking” & instantly his mood changed, he acted like he didn’t want to talk, and now went to sleep. I have no clue why he started being weird, is it because he doesn’t want me talking to my family? what do you think? (He randomly brought up how he didn’t mind our baby going to meet my family the other day so i’m not sure why he would be weird about me going over there.

EDIT: This isn’t necessarily his first time doing this, i fall out with my family very frequently just due to them not respecting me and whenever things rekindle he acts weird about it but I assumed it was because he didn’t like the way they treated me but now tonight it got me thinking a bit and it weirded me out as if it’s a problem but then again i feel like i’ve opened that door for him to feel that way towards them by running to him whenever there is a problem with them.