I need advice

Alright so my mother and i have a very toxic relationship. I’m 19 years old and I have literally nothing to my name because she has never allowed me to do anything for myself. I’ve been with my boyfriend for awhile now and he knows how ridiculously strict my mom is with me even as an adult. My mother and i get into maybe 5-10 arguments a day when I’m not at her restaurant working (which is everyday from 11am-11pm) since that’s the only place she allows me to work, and doesn’t pay me to add more fuel to the fire, well recently she’s had a problem that she doesn’t like me going to see my boyfriend. Understandable because when he came to my house the other day he wasn’t being super respectful to her cause he pretty much hates her for how he treats me, but she basically “forbid” me to go see him. Yesterday I had an argument with him about it and he basically told me he was going to get a place for me to move in with him in the next few months. So I need advice on if this is what I should do or if I should stay where I’m at. If i leave with him I get to be happy, but I loose my family (grandma and sister) and if I stay here I keep my family but loose my happiness. I just need some advice. Some help. I have absolutely no idea what I should do. I’m so in love with this man but I don’t want to loose my sister because my mother wants to get back at me for leaving.