Baby + abuse (long)

So I just had a baby right, he's almost 7 weeks old. Well his father and I are not together due to problems while I was pregnant but we were high school sweethearts who go pregnant together as young adults. Well throughout my pregnancy, it didn't go well at all. We broke up and he immediately started dating his on/off again girlfriend. Well he didn't come see the baby for about a month after he was born for whatever reason. We're not the best of friends but are being nice and civil for the sake of our son but honestly will probably get back together some day tbh.

Anyway, he's recently started to come see his baby but it's very strange. Every time he's come, he barely wants to hold him or anything, not that he doesn't want him, he just seems more interested in me. He just talks about life and tells me about his relationship. The first few days he told me how she's annoying and clingy and that kind of stuff, normal relationship stuff.

Well now I'm getting worried because it's seeming to get more serious. He came the other day and told me all about how he isn't allowed to do anything on his own like, he'll poop and she'll stand at the door. He's only allowed to shower with her, never on his own. She goes through his phone every night. He's not allowed to take care of himself in the bathroom but she won't have sex with him either. I know he's a grown man and obviously if he didn't wanna be with her he doesn't have to but she's crazy and they live together.

Well today he came and immediately started showing me marks of where she like, attacked him last night. He said they were fighting and he was trying to get away from her and she wouldn't let him leave. So he ended up having to throw her on the bed to make her stop and then left. Like I said, I know he doesn't have to deal with it but I'm starting to get worried. What she's doing (hitting him and being super controlling) is abuse and he's not the type to admit he needs help with something.

Him and I were together for 5 years and never laid a finger on each other in anger. Even my mom said the way he's acting is not normal and his family all tells me he's miserable. I feel like I need to do something but I don't know if I should or ever what I would do. My mom even said today, it seems like he's kind of using our son as an excuse to talk/hang out with me. All he talks about when he comes around is his girlfriend and basically how bad she treats him and he's constantly bringing up our past. Idk I feel like he's kind of trying to tell me something or ask for help. Idk what do you think? Am I reading too much into it? Is there something I should do or say? I'm getting worried and I don't want his girlfriend to like, ruin him..