You however, would lose the ability to claim some or all of the «spouse or common law partner amount». (moneysense.ca)
This means that gay and lesbian common law partners or people in relationships for several years but not yet married, have the very same rights as married couples. (ylaw.ca)
A separation agreement is a contract between former married or common law partners which outlines the terms of their divorce or separation. (familylawyerdivorcetoronto.com)