We've been together for 5 years and engaged for 4 years with a 2 year old child.
Recently had a fight with DP as he asked if our child could have cerebral palsy, because he "doesn't speak". Our child is perfectly smart and healthy, only speaks a bit slower as he's in a duolingual environment, he was speaking sentences when he was in a monolingual environment, but for him to ask this type of question, I feel it is not respectful to me and to our child. For that, I had a serious discussion with him, which couldn't be proceeded as he was only half engaged while playing games. I switched off his computer, and he asked me to take off the engagement ring, and "not to ask it back". As if in the past it was me begging him to give me my ring back. Even after the fight, he expressed that he has no plan of getting married with me because he didn't get anything out of our relationship. He has not made money in his investment or got promoted in his jobs, due to his own lack of insight and laziness, but he blamed all onto me.
Anyway, I'm planning my exit.
I've been living with him 2 years and I'm the person bought the home and paying the mortgage, as in his words I'm paying into my own pocket so he'll not help with any mortgage. He pays our child's nursery from the shared account but I pay in more than half what is needed for the nursery fees. He pays monthly shopping but it's less than what is worth for his share of the "rent/mortgage". Yet in his parent's mind, I'm taking advantage of him one way or another. And last time his dad found out that I took baby to wagamama, he scolded me for being wasteful, and told me off for spending on costa coffee when he's living on tesco meal deals.
In the past he also expressed that I don’t look pretty, and now I'm not making money, so I'm no longer attractive to him. Holy crap, I have no problem of being able to make money, but this is a red flag for me as if he despises me when I'm in my low point in life (having a baby set back my career progression although I'm totally capable of climbing back), even if he worships me when I'm rich and pretty I wouldn’t dare to take him back!
The question is, he purposely tells me off for being controlling when I asked him to move out of my flat in the past, and it ended up in nothing, we keep living together and raising a child together has distracted us from our problems. But he complaints about me bitterly, even after seeing my friend in a family holiday, he dared to say that he wanted to date my friend because she seems to be "less anxious of a mother" than me. He apologised afterwards but we never had sex since.
I'm asking for help as to how do I separate with him peacefully, without making it look too bad, but also protect my own interests: for example, ask him to leave in good time, even if I don't get my rent back, without having to involve the police for example if he refuses to move out. (As this has happened before and we ended up not breaking up).
Also how to work out shares on childcare and keep baby happy as before. (My hope is for him to be happier because it's not nice to grow up in a household where parents constantly fight).