Had to kick my boyfriend out

So, a little back story. My step dad is an asshole. He literally finds anything and everything to complain about. He would literally complain if the wind blew the wrong way, honestly. Anyways. We do not get along. Well, my mom is out of town for two days and I'm watching my brothers. My step dad is a truck driver and is rarely home. But he just happened to be home these two nights. Well, I guess he just can't stand the idea of my brothers having fun with my boyfriend, or me being happy. Because he decided that I needed to make my boyfriend go home bc there's a "bad storm" coming. So, I didn't believe him bc I'm used to him being dramatic, so I checked the weather myself, and it's just normal rain. So I told him that he was gonna leave at 12:30 like he usually does every night. Well he didn't like that answer. He got pissed, told me it was his house and that I don't have a right to tell him anything. I'm 18. Not 12. So he came into my room and started bitching at me IN FRONT OF MY BOYFRIEND WHO I HAD ALREADY TOLD HAD TO LEAVE. And so I started balling my eyes out in front of my boyfriend and he had to hold me and try to cheer me up. But I'm fed up with my step dads bullshit. I gotta get out of this house.

Also may I add that he literally got pissed off because my boyfriend was there without an "adult". IM 18 AND MY BOYFRIEND IS 20. AS IF WE WERE GOING TO FUCK WITH MY TWO LITTLE BROTHERS THERE THAT WE'RE BABYSITTING. ARE YOU KIDDING ME??

**EDIT** So today he told his two children, who are 4 and 7, that he was leaving and wasn't coming back. And then followed that with texting me and telling me that I'm the reason he's leaving and that its my fault. Because my mom "picks my side" and not his. And I "get whatever I want" which is not true.