<human>: Can you give me a shortened version of the text?

My boyfriend and his mother don't speak to each other very much because he resents that she beat him and his sister as children and because of her toxic argumentative and paranoid attitude, as well as arguments with her husband (that never get violent). Thus, she doesn't interfere or speak much the couple times I've gone over and she's there. My mom is very cautious and a bit nosy and while she doesn't like or dislike my boyfriend and believes him to be a good guy overall, she's become more concerned that I don't have much to say about his mother (while I've had conversations with his father). I've been protective of him whenever she asks if there's something wrong because I don't want to tell her his personal problems, but I'm starting to become a bit upset that she might not be supportive of our relationship if she finds out. 

I do want him to be able to develop a healthier relationship with his mother but I understand where he's coming from (personal experience as well) and don't want to push him, and I haven't pried him for information unless he volunteers to talk about it.

I really don't know what to do at this point. We've known each other for 3 years though we only really started hanging out for about half a year and dated for 4ish months. He's one of very very few people I know who shares a personality so similar to mine with similar humour, interests, values. I really don't want my mom to judge him or our relationship because of his family issues but I don't know how much more I can protect him.
<bot>: Mother doesn't know about boyfriend's stressful family environment, I'm afraid she'll disapprove of our relationship and pressure me to leave if she finds out.