Our interpersonal relationships are a huge component of our well-being. Mental-health professionals say that fringe friends, or those who we’d describe as the “supporting cast” in our life, can boost our social health. Additionally, the close friendships we keep offer us practical and emotional support, which let us reap mental-health benefits like increased happiness and connectedness. And, of course, if you're someone who likes to be in romantic relationships, those connections also have mental-health implications depending on how serious you are about the relationship and how much time you're spending together. But there’s a trait that some people value in love connections that isn’t exactly the best marker of a healthy, romantic relationship: unconditional love, or the belief that you should love someone—and that they should love you—no matter what. All of that said, it's crucial to understand why that’s the case.