What are the things needed to keep your relationship healthy?
Most people would answer that question with the big four: Trust, fidelity, communication, and conflict resolution.
While these are needed in order to have a successful relationship, there are many others that should be considered. These, in conjunction with the big four, will increase your relationship satisfaction.
I recently stumbled across an article that sums up what most healthy relationships need. I totally agree and could not have said it better myself.