If you are a tidy person considering living with someone new, do yourself a favor.. Go to where they live now, unannounced (don't give them a chance to clean up), and if you wouldn't feel comfortable moving right into that space as is, do NOT live with them! And for the love of anything you may hold sacred, do not marry them. It will NEVER get better. It might take a while, but every bit of affection you held will slowly be smothered out of you from the ceaseless cleaning, and perceived disrespect of your time, space, and person.. until you just want an end. What form that end comes in depends on the day.