How do I tell my F26 boyfriend M27 that I need to actually go to his current house before moving together?

I (F26) have still never been to my boyfriend’s house (M27). I have been in front of it to drop him off one time but never inside. We’ve been together nearly a year and a half. We get along great and he treats me very well. He’s at my house multiple times a week and regularly spends the night. However, he does not invite me over to his house. I’ve brought it up a few times and he always says it’s hard because he doesn’t get along with his roommate and his roommate doesn’t keep things clean. His roommate is his cousin and they go to family outings together regularly. They don’t fight, they just avoid each other. His cousin’s girlfriend is over every day which my boyfriend is always complaining about. My family has come up with wild conjectures on why he won’t invite me to his house. They range from secret wife (I’m close with his family, hard to believe) to skeletons in his closet. Occasionally I tell him what they say to me hoping he’ll understand how weird he’s being but he just laughs it off every time. I even straight up told him once that I think he’s hiding something from me and he sounded like he felt bad but just said the same thing he always does about his roommate. I know his cousin, we’ve met on numerous occasions so it’s not like he doesn’t want us to meet. He keeps talking about moving in together and getting our own place. I don’t see how I can do that when I’ve never even been to his house. I love the idea of living with him but it feels like it’s all out of order. I don’t know how to put my foot down about this without sounding like I’m demanding him to let me in his house. Update: https://www.reddit.com/r/relationship_advice/s/CY1s8Qrf9Z submitted by /u/DreamedUp to r/relationship_advice [link] [comments]