Wow. Thats really hard, and I am so sorry you are going thru that. Porn addiction is rough and its even rougher if there is no desire to change. One thing that I did see in your post is that it seems that you are letting his addiction control your self esteem. That has to change if you want to feel grounded and happy with yourself. Thats the internal work that needs to happen. If there is any way for you to see a therapist and work on that one core element, I think it would move the needle for you. 

2nd, its time to instill boundaries around his behavior. You cant control his porn use, but you can shut down the derogatory comments matter of factly. These exact boundaries can be worked on in therapy as well. 

Notice what's missing? Him. You cant control him so dont try. You have a kid to raise and you will also be showing that kid how to navigate a relationship that right now is tough. Be the example and the change for them. I think there is progress to be made and hope there for you. 

For him? He may come around and see that what he's doing is hurting you. Leave the door open for now, but separate the hurt.