I believe it is having a common goal in life to strive for. Me and my wife have several of these and it works wonders for our relationship.

I have to agree with what you have said there Antonio, they keep my marriage going good anyway

Agree. The good communication is very important. It is the foundation of trust. Without trust and communication love goes away.

Commitment to the relationship,

all of the other factors can be affected by events, for instance, trust can be affected by an affair,

but if you are committed to the relationship, even an affair will not break it -- it will hurt it, but will not break it

just a though

Love and respect is the key.
If you respect each other, you will not cheat, you will not lie, you give space, you have sincere interest is the where abouts of your spouse, your accept the other for who (s)he is.

To answer you question below:
In major decisions you discuss what the most sensible way is, you comprimize and take the dicision as a team.

Who makes all the major decisions are should it be a team decision?

being active listener does show that you truly care, great point michelle

Hi Tony. You've listed the most important things, in my opinion. If you don't have communication and trust, you really don't have much of a relationship. I also think you need to an active listener and show that you truly care what is on your significant other's mind.

Space. Been married to the same lady for 50+ years. I am convinced that if you have Unconditional love, Trust, Communication, and the ability to compromise, you each also need your own space. Good luck with your next relationship Antonio.

Tenacity
Ken