For you to be healthy as an individual, barring any unforeseen health hazards and genetic or hereditary factors, you have to decide to eat well, sleep well, do exercises, and take care of your mental health as well. Therefore, if you want your relationship to be healthy, you and your partner need to make conscious efforts to promote healthy behaviours, attitudes, and ultimately, healthy mindset in the relationship. And there are telltale signs that a relationship is healthy.