Boyfriend’s mother is toxic to him

My boyfriend’s mother is super sweet to me but she is terrible to him. He is 20, his dad committed suicide when he was 9 so it’s just him and his mom now. His mom has these nights where she yells at him and puts him down about not helping out around the house, not being responsible enough, failing in his career, never going to amount to anything...

His mom does a lot for him like cooking, cleaning, doing his laundry, etc. But without him asking her to do it. He is capable of doing it himself. He cooks and buys groceries and pays rent to his mother and is a good normal 20 year old son, does more for her then I do for my mother. But every once in a while she will yell at him for coming home late (even from work where he often works overtime) and not helping out around the house. She says that he would be nothing without her and that she is the only reason he is able to be successful in his job (full time office job at an airline).

She tells him he’s a bad son and that he isn’t going to do anything with his life, even though he is doing so good right now. He often thinks about moving out but knows that his mom would freak and maybe not let him. There’s no pleasing this woman and this toxic circle is really hard for me to watch my boyfriend go through over and over again.