relationship

For sustainable relationship there must be love, trust to each other, proper understanding, matching of views, ready to compromise if required, taking care of partner's requirement, respect to each others, full support during trouble. These are the few things which makes a relationship stable & life long.

i believe that love, the willingness to work things out together, trust, passion, creativity and respect keeps a relationship going.

I think it would be trust, honesty, understanding and passion

Most important elements required in a sustainable relationship is loyal friendship.

I think Love is the most important factor, if you love him/her then u will be able to accept his/her faults and be thankful for his/her good qualities, factors that help building a relationshaip, will be trust and communication

with my husband and i... communication or lack of (know when to keep your mouth closed... and dont answer the retorical questions LOL) humour in life (ive picked up the phrase "how do you figure" instead of what do you mean... out of the blue i got a responce of "with math") and time to be yourself-possibly by yourself (sure your in the relationship but you are not a single unit). Lastly, dont sweat the small stuff... if you catch your spouce flurting with a customer service person fine.. he just wants to know he still has it. if hes flurting with a co-worker... kill him LOL