Help me!!!!

Okay this may seem silly but it’s

Really bothering me. My boyfriends mom is a so like hands on type person. She’s constantly putting her hands on him. And today she PUT HER HANDS ON ME. I was doing something with my boyfriend and she wanted to snatch my phone out of my hand and I grabbed it and stuffed it behind my boyfriends head so she couldn’t get it. Then she slapped my arm fucking hard! When my boyfriend spoke up her response was. WHAT IM ALLOWED I hit like I hit you. I wanted to go off on her but I was brought up to respect people so I kept my mouth shut. As she left the room she poked my hard into my ass cheek twice. I want to say something to my

Boyfriend but it’s his mom so I’m like nervous I don’t wanna offend him.

Please help me.