There are two basic requirements: residence and marriage breakdown, the latter of which can be established by separation or adultery.
Residence is established by at least one spouse having been ordinarily resident in British Columbia for at least one year prior to the first court filing.
Separation requires that you live “separate and apart” - this does not necessarily mean in separate homes. Many people separate, but temporarily continue living in the same home, usually for economic reasons.
Adultery requires that you or your spouse committed adultery during the marriage.