Are you open and honest about your past and present? Are you sharing your goals for the future with your partner? Or are you expecting that your partner will fix your problems and compensate for your shortcomings—perhaps without disclosing these expectations to him or her? If so, you could be setting yourself up for trouble ahead.
Rule # 1 for healthy relationship start: Rather than hiding your problems, be honest about your hopes, expectations and even your fears. Try not to hide these things, but try to determine if you and your partner are looking forward to the same relationship. Develop plans with your partner and take joint responsibility for the well-being of the relationship.
If you do this much, you will not end up in a relationship with a stranger—perhaps someone who would not even be a satisfactory roommate.