Really if you want to get married, you shouldn't live together first because the incentive for marriage is not there. Marriage is not something to be entered into lighltly. If two people do not have the same goals and expectations in a relationship then the relationship is bound to eventually fail. Forcing someone into marriage is not the way to go. You are better off to cut your ties no matter how much it hurts at first and move on with your life.
There are couples who live together and are perfectly happy with that arrangement but you need to know going in what kind of comittment you are wanting. Be mutually happy and have respect for the other persons decision.