Can Two People Ever Truly Know One Another?

Can two people ever truly know one another? This article explores the limits of understanding in relationships, revealing how assumptions, personal history and curiosity shape emotional connection. Learn why lasting relationships depend less on certainty and more on continual discovery, open communication and a willingness to keep learning together.

One of the assumptions we often make about relationships is that, given time, two people will know all there is about each other. We talk of the mature love stage where nothing new is to be learnt. We often make statements like “ they know me better than anyone else” or being with someone who “understands everything about me.” It is an attractive idea, but I am not convinced it is entirely true.

No matter how close we become to another person, part of their inner world will always remain private. We can know someone’s habits, routines and opinions. We know what makes them laugh, what scares them and what their hopes are. We can spend decades living together and still be surprised by their reactions, their thoughts or the emotions they have kept hidden. This is simply part of being human.

Each of us experiences life from the inside. Our memories, interpretations and private reflections are filtered heavily through a lifetime of experiences that nobody else has lived. We can describe these experiences but no-one can ever experience them exactly as we did. This has important implications for relationships.

Much conflict arises because we believe our partner should understand us, often without explanation. We assume that if they truly loved us, they would know what we need and what to say to make us feel better. When they don’t, we come to the conclusion that they don’t care. In reality, they may simply be seeing the situation through a different psychological lens.

The same event can carry different meanings for different people. A delayed text message may feel insignificant for one partner but devastating for the other. A request for time alone or space may represent healthy self care for one person and rejection for the other. Neither interpretation is necessarily wrong. They just reflect different internal worlds. This is why curiosity is so important in relationships.

When we stop being curious, as often happens as a relationship matures, we replace fact and reality with assumption. We think we already know why and how our partner behaves and reacts. We finish their sentences, predict their motives and interpret their every move without checking to see if our assumptions are correct. Gradually, we relate to the version of them we have created and stop relating to the person in front of us.

The issue is that assumptions are often based less on our partner’s behaviour and more on our own history. If we have experienced things like rejection in previous relationships, we may assume distance means abandonment. If we grew up feeling criticised, even neutral comments can sound like judgment. Our minds constantly try to make sense of the present by referring to the past. This happens so automatically that we rarely stop to ask if our interpretation is the only possible explanation. In therapy, a valuable development comes when clients move from saying “I know why they did that,” to asking, “I wonder what was happening for them?” That small change replaces certainty with curiosity, and curiosity is often where understanding begins.

I often see this in therapy. Couples arrive believing they know exactly why the other behaves the way they do and will often use this to predict future behaviour. Sometimes, one is convinced their partner no longer cares. The other has given up because they feel they are not heard and can’t do anything right. Yet as each begins to speak, a different picture emerges. Behind withdrawal lies fear rather than indifference. Behind criticism lies anxiety rather than contempt. Neither partner had been malicious. Both had simply mistaken interpretation for understanding.

Accepting that we can never fully know another person should be liberating for a relationship. It might remind us that there is always something left to discover, if we are curious enough. It’s about being open enough to believe that the person we love can still grow, change and surprise us. The same is true of ourselves. Most people can look back to the past and recognise that they are not the same person they once were. Priorities, beliefs and understanding of ourselves deepen. If we are continually changing, it follows that our partner cannot fully know a version of us that has not yet emerged.

Perhaps the healthiest of relationships are built on this acceptance. Instead of assumption, continual discovery is called for. Curiosity instead of assumption. In many ways, this is what keeps a relationship alive. Not the belief that we have finally understood one another, but the willingness to keep learning. After all, if another person’s inner world is never completely known, then every meaningful conversation becomes an opportunity to explore it a little further.

Perhaps the goal of a relationship is not to know another person completely. Perhaps it is to remain interested in who they are becoming, while allowing them the same privilege of discovering who we are still becoming ourselves.

If you recognise yourself in these patterns, therapy can help you explore the origins of your relationship blueprint and develop healthier ways of connecting with yourself and others. Awareness is an important beginning, but meaningful change occurs when awareness is translated into action.

If you would like support with this process, I offer a free initial consultation where we can explore your situation and discuss how therapy may help.