If I was to become a common law partner with my girlfriend (live with her for one year) It says things to show that we stayed together are bills we have shared. What if I am not paying any of the bills? Can I show them the plane ticket there and maybe pictures of us living together? Also, If I after a year, were to come back to the US for a month or a few, would she have to sponsor me as if I am living in Canada? Or like I am living in America?