(a) Trust in all aspects. (b) Honesty in your actions toward yourself and partner. (c) Communication must be completely open for any topic and must be both ways.
One-way relationships are NOT beneficial nor does it help a person's well being. When any of the three I've pointed out is missing, then your actions should be in your own self-interest and your well being.
Make NO decisions based on emotions, otherwise the foundation won't survive.
Here is another piece of insight and believe it or not, it's the hardest thing to do- STOP living in the past. If you got hurt, realize why? or how? it happened, learn from it and move on.
If you dwell on past actions, which trust, honesty or communications has been damaged, it is for you to consider if it really matter and how much. If you can't move on, then the relationship will not move on either.
Cagsil, great observation and effort to inform but people want to hang on, it's too painful to let go and familiar territory is what creates security, or at least the perception of it. Living in the past is what most of us do. Fear of the future and confusion of the now are much more difficult that holding th past.
I do really appreciate your view on relationships though. It's very smart.