Oh yeah, I totally forgot that it was actually his house and her moving in with him was initially unplanned. Definitely seems weird that he'd sell his house and give up a job just like that, and move across the country. Agree that their relationship is weird, it's also strange she doesn't share any photos of him at all, whereas she shares quite a few with Atti, although his face is covered up. Like if she went on a trip with him to Chicago, wouldn't she share at least one thing of them together or just him in a restaurant or something?
Maybe she pressured him to sell the house and for them to buy something that's both of theirs? Since they don't seem interested in marriage, which is fine, that might have been important for her to secure the relationship with?
She's so strange about what she shares and doesn't share online (i.e way too much period talk, but wouldn't say they were planning to move because she didn't want people to find their house on RightMove?) I wouldn't be surprised that one weekend she'll be quiet again and 'surprise, we bought a house and moved in! Here's a shot of me on the couch in the new living room eating chocolate and no other information, please and thank you.'