I need advice 😔

La
Okay, so my mom is making me choose between staying with my boyfriend or moving out... I don't want to break up with him.. but I don't want to move out just yet.. I'm still in college and haven't gotten married... this started because she was arguing with him and he was staying calm until she said something to him and he was already in a bad mood and she knew that, yet she still said it and he got really upset and gave her attitude but didn't like yell at her or anything just responded with attitude. Then he said "you know what I'm just going to stay shut." And she said "yeah, just stay shut." Then he got out the car and walked away but he didn't slam the door or anything. A lil while later, he called me while I was still in the car with her and said "that wasn't right how your mom was talking to me." While I was on the phone with him, she started screaming "TO HELL WITH HIM IDC" blah blah blah..  then she gave me this ultimatum.. idk what to do guys... he has in the past disrespected her but he has improved so much and he hasn't done anything to disrespect her.. actually.. I feel like she was wrong this time.. any advice???