Painful....

So first I am 27, my baby’s father is 48. He used to be my best friend but now I honestly don’t know where we stand. I’m 28 weeks pregnant with his first son, which is our first ongoing pregnancy together after two miscarriages. I thank God nearly everyday. My issue at hand is my baby’s father also is a caregiver for his mom. Honestly, I really don’t like her because she is manipulating and she does childish things against me towards him. She says mean things about me and to me a few times then he acts as if she doesn’t know what she’s doing when she does. He also told me that she said to him about his other daughter who is now deceased, God bless her soul, “You care about that b🤬 more than you care about me?” Like what grandma says that’s about her own grandchild. So off all the things I said above, I made the decision to not let her around my baby. I feel like if he can’t fight for what’s right and stand up for me then I don’t care how he feels about her begging to see my son and I also don’t want any negativity and pure evilness around my son. My baby’s father lives with mom and I feel so lonely and have felt lonely the entire 6 years we have been together. I don’t know how I made it this far.?.?. He’s always at home and rarely spends time with me and we have been physically and verbally abusive towards one another. He knocked his mom’s tooth out twice by slapping her. He is addicted to weed and hydrocodone. I was addicted to hydros too now I’m going on a year clean 🙌🏾 when I bring up issues I’m concerned about he makes an attempt to start doing better but then it’s back to the same crap sooner or later. His mom has dementia and is wheelchair ridden and I don’t feel like she’s getting any better. She is also addicted to pills and he feeds them to her she cries and begs for them. The doctor doesn’t know about any of this and she is supposed to be taking water pills for fluid on her legs with WATER but he NEVER gives her water only Sprite all day everyday. He sells drugs from her house everyday and she allows it. I don’t know if he is giving her his life to take care of her when he has a new child coming to take care of and a life that he supposedly wants with me. I don’t understand what’s going on I really don’t I’m so empty and emotionally drained guys. I am the breadwinner so no I’m not there for money hell the only expensive thing he bought me was a necklace. I want him to put her in a home to get better care and so that he want be throwing his life away taking care of son who has already lived their life when there are people who need him more than her. He also has Acid Reflux and receives Ssd for his shoulder he threw out of place. I feel so trapped and disappointed in myself and in him. Like why do I feel like I mean nothing to him? Why do I feel his mom and him act like they are husband and wife? When will he value his family over his mom? Please don’t judge this is real life and I am expecting real answers. Everyone does stupid things we live and learn. I sit back and think sometimes about how much I can’t stand his mom I literally hate her existence. God forgive me please. I feel like she is jealous of me and manipulates his immature ass mind to think whatever she wants it to. The only power I have is over the rights of my baby and she know he will be attached to this new baby and she won’t and doesn’t have any say so AT ALL. Am I wasting my time and my young life? Please help me?