AIO I (19f) think my bf (24m) is secretly married

I (19f) have been with my bf (24m) for nearly a year now. And we have had some issues for a good majority of the relationship. Mostly because he tells me stories and explanations that don’t make sense, and I feel that he is lying about things. These things include whether he has a friend (who was texting me) or if it was him texting me pretending to be this friend. I’m not going into this a lot but he has no pictures of this friend, no social medias other than a Snapchat with no avatar, and he types and sounds in voice notes eerily similar to his “friend.” But when I confronted him on this he gave excuses and hard to believe explanations but I gave in because i felt so guilty. When I gave in we pretended everything was fine for a while, and sometimes it was. But I still had such a bad gut feeling about everything. Then recently, I was at his house. He has strange rules for me that I have to follow when I am there. I can’t ring the doorbell, I can’t walk into or be in rooms that have a camera, I can’t come over while his “sister” is there, and also worth noting I can’t leave any of my things there. His sister lives there with him. She installed the cameras, and he says he does not want me to be seen on them. I think this is also why I can’t ring the doorbell, because maybe it triggers a camera recording. I have told him many times that it upsets me when I feel like I don’t have a real place in his life, and that I feel like he keeps me hidden. Worth noting he has not introduced me to any friends or family in almost a year of dating. He keeps saying he wants to, but makes it difficult/impossible to schedule. But anyway I’m at his house, and I am noticing all these decorative signs hung on the walls. I’ve been there before but this time I was waiting for him to get the car and I had time to actually look at the walls, usually he rushes me up to his room (and most of the bottom floor is off limits to me anyway for cameras). The signs say things like Mr. And Mrs., there’s a tray with rings that says his and hers, and another sign with both their names on it that also has a date. I’ve had this bad feeling for a while and now it’s worse. But I let it go because I have something important to go to. Later that night, I am adding my friends on a new Facebook account, and I go to add him. The pfp is him kissing his “sister” and her holding her hand out, with a ring on it. Now I’m upset cause that looks like an engagement announcement. It is also coincidentally a year before the date on the sign that had their names on it. I am mad and I turn off my phone to go to bed. In the morning, a Facebook friend suggestion comes up and it’s his “sister” (wife). I look at her profile and she has about ten photos of the two of them together, and no other photos with any other people until you go back to what I assume was her in high school. There are multiple pictures of her in a wedding dress and him in a suit with matching flowers, and all the comments on the post say things like “congratulations to you both!” “Best couple” “may god bless this marriage.” And the post caption is THE DATE ON THE SIGN IN THE HOUSE WITH THEIR NAMES ON IT. ITS A WEDDING ANNIVERSARY. And now he has responded to my text that I saw his pfp and that is where these messages begin. He says all the wedding pictures are just him and her because they are close. And he said that the sign with their wedding date and names is not referring to him because her husband coincidentally has the same name as him. I was so defeated because it seems like every time we have this conversation I am the crazy person. He accuses me of stalking him and his family online, though I don’t GO SEARCHING for this stuff. Anyway I am tired and I feel crazy again. This shit has me questioning reality. Am I crazy? Please help me. This is still going on he is still texting me that I fucked this all up and I don’t know what to do. Worth noting: he is really good at lying through text. He impersonated me over text once, acted out whole conversations perfectly. I would have believed he was me.