I would be very suspiscious of her intent. Cowgirl came to mind for me too. As did that maybe she just doesn't like you that much that she would want to live with you.
If it doesn't happen that you live there too I guess you could request some boundaries that work for you around time together. When Mono lived across town I called his house my OH. I loved having a place to go. Maybe finding a place you feel more like its home and having him stay over would balance things more.
Anyone want to be friends on Facebook?
Send me your name via PM