First, pics of prospective live-in needed before honest answer can be given.
Second, get used to the idea that what's yours is hers and what's hers is hers. No crap.
Third, find a way to have your own spending money. Preferably some cash only piddly job. Never, never ever tell her about it.
Fourth, if you need more bed space, learn to snore. The louder the better.
