I Hate his mom

I hate my boyfriend’s mom and every other woman that ever hurt him. He’s having a hard time in life and I’m catching all of it. She abused and neglected him as a child and in return he acted out. He never really got to be a child and now he is an adult and is..idk..regressing? He talks about how much he dislikes his mom all the time. They are not very close. As a young child he never learned how to respect a woman or treat a woman from her and surely not his father. He received great mentorship and learned how to do things the right way as a teen. But now at almost 26, he is regressing to immaturity and disrespect and is starting to treat ME how he treats/treated his mom plus more. His mom is an okay lady but makes no effort to make amends with her son. She scarred him and I hate her for that! 😭😡🤬