Why is he pressing for us to be together so bad rather than just co parent with me?

Before I got pregnant with my son, my child’s father and I were very toxic and always on and off. He was also very abusive physically and he still is abusive emotionally, verbally and mentally. I even left him at five months due to him being physically violent toward me but I decided to give him a second chance to be in his sons life because he didn’t ask for that to be his father or for me to be his mother and it wasn’t like I didn’t know his father was abusive when I continued to lay down with him and have unprotected sex to create him. I just feel the least I can do is make sure they have some kind of relationship with each other but that’s all I want. I don’t want to be with him again. I don’t want a relationship. I just want him to co parent with me but he can’t seem to except that. He wants family photos, he still gets insanely jealousy over ridiculous things. He questions who I talk to as far as other men outside of him and I don’t talk to anyone because I’m more focused on being a mother/parent but it shouldn’t matter if I did because as I said I don’t want to be together and I don’t consider us as being back together. He’s overly clingy, he doesn’t want me to take our son to be introduced to anyone else without him being with us etc it’s just overwhelming and too much trying to co parent with some one like him.

Why is he pressing for us to be together so bad rather than just co parent with me?
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