Create communication channels. Understand each other by learning how to read your partners emotions. Maintain eye contact while talking and listen attentively to each other. Speak your mind honestly and ask for what you want and need from each other; remember that no one can read minds. Show affection when talking by holding hands or sitting close to each other.
Compromise with one other's feelings, wants and needs. If one of you wants to visit a museum and the other to watch a movie, visit the museum together and watch a movie on a different day. Apply this to more complex situations as well. Learn what your partner likes and communicate your likes as well. Never insist on having everything you want; it builds resentment, creating distance in the relationship.
Resolve conflict respectfully. Do not argue when you're angry; try to take some time and let the anger cool down. Listen to each other. Take turns while talking and speak your mind honestly. Focus on resolving the conflict rather than on "winning." Avoid blaming each other. Take responsibility and apologize when you are wrong. Speak softly and in a loving tone. Assure each other of your love after a disagreement.
Expect difficulties and tackle them together. One partner might be having personal problems like the loss of a family member or loss of a job. The other partner should try to be understanding and help whenever he can. The affected partner should accept help from the spouse. Never vent your stress towards your partner. Accept change if it is the solution to your problems.
Balance your needs as individuals and as a couple. Remember that a single person cannot satisfy all your needs. Make friends outside the relationship and develop hobbies away from each other. Make the best of you time together, share jokes and meals and help each other out whenever possible.