H a p p i n e s s : one can be happy with that person, but what if the love is just not there?

L O Y A L T Y : I think "Loyalty" is the most important, to me, because both will remain true to one another no matter what obstacles that come their way.

R e s p e c t : in a relationship one can have respect, but what if the affection is not there?

T r u s t : trust is important to me, but not the most important. Trust has a limit that it reaches.

H o n e s t y : the significant other can be telling the truth, but what if it's about cheating?

F r e e d o m : Freedom can mean many things and also it has its limit in a relationship.

I would say Trust. You both need trust with in the relationship to be able to have a healthy relationship. And like food said, loyalty is important too. To maintain a healthy and loving relationship :D

Happiness, true happiness is all of the world's virtue combined in one. If one can obtain happiness with someone they love, it's the ultimate form of love. ^^

Yes, I think happiness is all of them combine. Loyalty is important too, but why be loyalty when you are not even happy. When your happy you're loyal because all you see and feel is that person. But what happens to loyalty when you are not happy any more? Does happiness motivate loyalty or visa versa? It just depends on how you see it, there is no right or wrong.