I’d tell her to pay attention to how he treats his mother or how he treats any women in his life. A lack of friendships with women is also a red flag.
If he feels comfortable making rape jokes, he views women as objects. Stuff. Another “thing” in his life.
When he expects you to do stuff for him without prompting, and then gets mad when it’s not done. It’s all conditioning.
Run. You are so much better off on your own. Fight for the love of your life; yourself.