The phrase "life wife" refers to a person who is like a partner or spouse, but they are not married. They are someone you rely on and share your life with, but without the legal or formal commitment of marriage. Full definition
The couple — the director and his real life wife — are involved in a finished relationship that neither can fully release each other from and it makes for a wonderful film. (metacritic.com)
I have this whole secret life my wife doesn't know about. (richardnicastro.com)
I am married man but no sex life it wife hate sex it. (meetlocalmilfs.com)