Open honest communication. With my bf I can ask him anything, talk to him about anything, and I know he isn't going to lie to me. Trust, and dedication, loyalty. I think people fall in love and forget to look at the long haul. You have to know your partner will be there for you, and that you will be there for them, even when things are rough. Acceptance, I love my bf for everything he is, even the parts that drive me insane, I never would consider trying to change him, I know I have to take the good with the bad, because they all make up the person he is, and that is the person I love.