If it is "really" only since you moved in with your boyfriend, then I say, "dump him". Seriously though... "dump him". Just kidding, it must be the change in environment. Most likely she is foraging for food because there is "food to be had". Every time she is successful in getting to/locating some, it reinforces in her that it is a good and worthwhile thing to be doing.

Try making absolutely sure that there is no food within reach of her and that it is not tantalizing dangling where she can't reach either. Try eliminate all smells and trace odors and take the garbage out in a vestibule, garage shed or even just take it out of the house for the day until you come home. And oh yeah... "dump your man".