What is the one aspect in a relationship that must aways remain throughout (68)

Honesty is the make or break one.

Including trust.

Trust , honesty and good communication, in that order.

The thing about trust is that it is really hard to place trust on someone that is not honest; however if they are, lack of trust may have a legitimate reason. An example may be that I can not trust a girlfriend to be on time for anything; but she may have a problematic babysitter so it is not a concern, but rather something worked around.

all of them,plus money.

this doesn't work for me,,,who can you honestly trust? and who can you trust to be honest,, these two should be put together, the fact probably is that many people choose honesty, and it might be giving a false impression, and what about the most important of all, FAITHFULNESS, coupled with loyalty,,these are two building blocks that you have missed altogether,

Yes!! you have to have a person besides yourself in the relationship!!!!!!!

OP, you seem to think you have the answer. I don't think you do. It seems to me most everyone under values the importance of respect. If you have respect, you have trust, honesty, friendship and honor. Without respect, you don't have those things; at least I don't. I don't have friends I don't respect. I don't love people I don't respect. I don't have a mutually trusting relationship with someone I can't respect. There is no honor or true communication with someone you don't respect. Without respect, you have nothing.

I would have to select Respect because without it none of the other answers could exist and it would apply to any relationship.

Somebody doesn't become your enemy until they've betrayed your trust in some form or another, so the point is moot. You can trust someone you don't like. There are doctors whose skills I value greatly, but I think they suck as human beings.

In my opinion it's "integrity" because that encompasses all of the above and then some. I cannot have a relationship with a person who lacks integrity.

and what if you are still attracted to the person but you
Do not trust them?

Trust/honesty is very important to me. It encompasses all areas of a relationship.

this thread got me thinking, and researching on line, and i found an article that i thought summed things up rather well, which a have copied and pasted
1.commitment
2.conscious attention
3.respect (which includes gratitude)
4.trust
5.bonding

sorry for it's length, but i thought it might be a good read

The first essential quality is commitment. When we make a commitment to a relationship, we have some degree of unconditional regard for the relationship. The relationship is reciprocal and we are present in the relationship when it is easy and meets our needs, as well as when it is a difficult struggle and we feel like we are doing all the giving. To make such a commitment, we must be capable of selfless service beyond the needs of our ego and the relationship must have a deeper vision or meaning which transcends those unpleasant times.

The second essential quality is conscious attention. All healthy relationships require consistent, ongoing, conscious attention to survive and thrive. It is a simple fact that whenever we put our attention on something, we are choosing to create more of it. Similarly, whatever we ignore, we are choosing to let go of and allow to fade out of our lives. Where we choose to put our attention and how long we do so is one of the most important decisions we have to make in our lives. A foundational skill to all healthy relationships is the ability to really be present to understand what is going on for the other: listening with our ears, feeling with our hearts, seeing with our eyes and sensing with our intuition. What does this other person really need? What do I need right now to feel in harmony?

con't

respect:
The third essential quality is respect. We can consciously attend to other people, but if we do so from an attitude of manipulation and control, the outcome will be a one-sided unhealthy relationship. An attitude of respect, on the other hand, nourishes the heart of both participants and assures that each person's needs are attended to. Related to respect is gratitude. When we commit to a relationship, give it conscious attention, and feel respect for the person or entity we are in relationship with, we naturally are grateful for their presence in our lives. We honor the gifts they bring us and communicate our gratitude on a regular basis, in whatever form feels right.

trust:
Another essential quality to a healthy relationship is trust. We must be able to trust when things appear to be going nowhere in our lives. We must have faith that there is something going on that we cannot comprehend or see. Similarly, when we are quiet and mindful and listen to our self, we must trust the impulses from that small, still voice within when it suddenly urges us to go off in a new direction.

last installment..
sorry for the length

bonding:The sixth essential quality is bonding. In any alive relationship, there must be a mechanism for an ongoing connection, for a reciprocal exchange of energy, which is bonding. Bonding is a basic human need. We are most bonded with other people when we are touching and also maintaining eye contact.

I don't say I agree with every word of the article you have quoted, or what the '6' essential components of a successful relationship are, but I do agree that you can't hang a relationship on just one essential element. If you had only one essential element and no others, the relationship would be doomed to failure. Life is just not that simple.