Loyalty

yes, and trust as well. of course the greatest of them all is love.

Oh completely, you better believe it! Loyalty and Honesty go side by side. You have to know 100% that you can trust the other person in your relationship. If you have any doubts then it can make some really bad problems arise. Loyalty means basically that he / she will stick with you and only you no matter what. If someone doesn't stick with you and cheats on you not only were they not loyal but you can't trust them because they have no honesty. So once again yes loyalty is VERY important.

Loyalty is one of the nine noble virtues. and I beleive, the most important of them.

yeah yoalty is very imortant and even i blieve it s the most important thing

I compeletely agree you have to be able to rust one another and be able to reley on them in needs be.