It is not enough to agree upon expectations, the parties must monitor how well they are being met and whether or not they need to be modified. Failure to do so will result in lack of trust in the process. Relationships need reinforcement Very often, parties in a relationship look for more than the obvious rewards of participation. This can be said of interpersonal relationships. I suspect that more two person relationships are dissolved with a root cause of lack of appreciation than other reasons.
Relationships stay strong when the parties appreciate and trust each other.
The other side of the coin are examples of people with an overabundance of talent who failed because they fully expected to do so. Positive thinking is the fuel that drives the engine of success. If the parties are committed and agree to defining and meeting the expectations of each other, the relationship will be successful. Success is measured by achieving defined goals and meeting expectations to the satisfaction of all. It is only the misapplication or lack of maintenance of the process that leads to failure.