Bf asked me to move in

So my boyfriend of 5 months just got a house and he’s been assuming I’m going to be moving in with him. I kinda gave him the hint tonight that I wasn’t sure about moving in only because the last time I moved in with someone I was with it didn’t last but I’m thinking he’s still not getting it.

A little backstory. I’ve been living in my family owned house for 5 years. It’s very small. One bedroom house with my two kids. We’ve made do with what we have even though it’s not ideal. I have only moved out one time with my ex fiancé only to it have been us being up our butts and fighting with each other until I decided to leave because it was starting to get physical.

A part of me wants to move in with my current boyfriend but at the same time I feel like it’s still too early. He’s done a lot of thinking ahead of this. His place would be a two bedroom so it’s a little better. One bedroom for me and him and the kids can share a bedroom. He went as far as to getting a family van for all of us. He seems pretty invested into the idea of all of us being a family. Which is great. But I guess I’m just feeling extremely nervous about things turning out the same way as they did with my ex. I HATED moving back into my house when I called things off. Everyone knows what a pain it is to move just imagine moving in only to move out a month later back to where you were. I just don’t want that to happen again or be left with nowhere to go. I think I’d feel more secure if we were like married or something and maybe that’s pushing it… idk. I remember a couple months ago when he first brought it up and I mentioned to him about wanting to help him get the place and he had a very stern “It’s MY house” and not anything you will be helping me with. So already it’s felt kinda one sided and not so much of a place for “us” but more of a place for him. Which I get he’s buying it. Would it be wrong to just tell him I want to live separately for a little bit until I’m comfortable moving in? He’s seriously just stuck on this idea that me and the kids will be moving right in with him and I just can’t right now. I don’t wanna hurt his feelings or even give him doubt about our future. It’s just a big move I’m not ready for yet well fully anyways. Help?