What did you sign up for in the relationship?

When you sign up for a relationship, you sign up for who they are now but are you signing up for who you hope they'll be as well? Are the expectations that should be met when it comes to a relationship? And if they aren't met, do you have every right to demand they be met, "or else?" Sometimes we need to revisit the contract we signed getting into a relationship and what it means for us if who we thought they were isn't really who they are.