In this sort of context, "you don't want to (wanna) do something" is advice, meaning "In my opinion you should not do something."
Thus your sentence means something like:
I suggest you don't keep living with her.
You should stop living with her.
It would be best for you to stop living with her.
You wanna get your hair cut = You need a haircut
You don't want to listen to him = He talks a load of bullshit
You wanna mind your own business = Keep your nose out
This expression is fairly informal, hence I use the contraction "wanna" in some examples above.