Should I even continue this relationship

So I’m currently pregnant 25 weeks and I live with my bf and his family. About a month and a half ago they planned a trip and invited me to go, somehow the trip got canceled, shortly after about a week ago he confronts me again talking about another trip they planned out, this time it’s without me, mind you it’s me and my 5 year old son who’s not his biological dad we both stay here. Either way he tells me they are leaving on Monday and that I would need to be in his room locked up. Yes the lock will be on the outside of the door there’s no way I can enter the house while they are gone, the room is connected To a studio so I can still go in and out and I’ll have food and such like that. I obviously got offended and asked why wasn’t I invited and he tells me that his sister is not my family and that she’s the one who planned it so he’s just going by what she says. Also mentions to me he doesn’t really know where they are going which I call bullshit I’m pretty sure he knows and probably might bring a friend that’s a girl like he’s done in the past. I get that this is the sisters house and she makes the rules but the fact that he doesn’t step up for me. They talk behind my back. She literally has said how she doesn’t trust me or my son to be in the main house that’s why she’s locking up the door so we can’t go out. I honestly don’t know whether to be pissed or get over it. they don’t think they’re doing anything bad at all. I just don’t feel like a part of this family at all, I am moving out in about a week I’m just worried about how this will all play out with a Newborn and his family, I did mention to her if this is how you guys will treat me and my son pls have the same attitude with this newborn. And the reason why I said that was because my bf asked so if I wanted to take our baby on a family trip you wouldn’t let me, and I told him if it’s without me no. Like wtf I don’t feel like they even respect me as a mother I’m just someone who’s in the room paying rent. Disgusting people. There’s more that they do but I rather just leave it here.