Welcome aboard, NicknNora, and thank you for an interesting question.
Our analysis is ageless. The presence and strength of the four basic ingredients of a relationship are determined at time of birth, based on the relationships (aspects) between planets, houses, and signs at time of birth.
Disappointed? Don't be because we both know that the main thing that changes through time is the decisions that we make. No methodology on earth can analyze the nature of choices and the curve of personal growth that we go through other than ourselves.
Good new, though. We can exercise some confidence in predicting what choices others would make. For example:
a) Would a parson who lacks commitment be more lenient toward improving the relationship and overcoming obstacles or towards braking up and starting a fresh page?
b) Would a person who lacks intimacy share his/her frustrations, fears, and weaknesses with the partner or will sweep it all under the rug until time of unavoidable eruption?
3) Would a passionless relationship call for straying more often than one that enjoys strong physical bond between the partners?
4) Would a business venture with no synergy between the core partners will be as strong as when synergic decisions and actions are being made?
I hope that your question was answered in full. Keep it coming