One thing is for sure about life. If you live to be a certain age, you will have history. Some of it will have shaped you, some was bruising, and some of it helped you to become who you are today. When two individuals come together to try and build something, that history, good or bad, doesn’t just disappear (much as we would like it sometimes), it follows us into the relationship. Often, it rears its ugly head when things become shaky, trust is challenged or old wounds open. 

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The extent to which our history influences a relationship will depend on the two people concerned and the emotional distance they have travelled beforehand. For some people, the past is simply context, something to understand but not obsess over. Yet for others, especially those who have been stung badly by relationships, the past becomes a data point to mine for evidence. It becomes a place to justify distance or flight. I know clients who are extremely judgemental about their partner’s “body count”, even if they have a similar number or even more. Of course, its not really about that. 

Many people enter relationships on “high alert”, and when this happens, all information gained becomes important, and the past is a great place to look for it. Patterns of behaviour, old attachments, previous partners and decisions made are all put under the spotlight. If someone has a tendency towards abuse, then that information really matters and should be acted upon, and that is just sensible, but many aren’t just looking for that.

Most people aren’t seeking safety in the information gained, they are seeking certainty, but certainty doesn’t exist in relationships. That’s when curiosity becomes compulsion and obsession. What begins as a desire to “find out who I am with” becomes something much deeper “I need to know I’m better than who was there before me.” We want to be “the one”, the once-in-a-lifetime person, the irreplaceable one, the one who finally made their partner feel something real and alive. It’s a very human trait to feel chosen, special and uniquely significant in the eyes of their new partner.

However, when it gets too much, it starts to be something different. People start investigating, scrolling through old photos, dissecting social media, checking (often breaking into) phones, combing through messages and setting tests and questioning their partner to gain information and test reactions. They seek reassurance but get insecurity. Unfortunately, the more they dig, the more they often find that can be interpreted in the way they want it to. This isn’t because there is something wrong with  their new partner, it’s because the past doesn’t come in neat little packages. It’s often untidy and contains mistakes, regrets, rough edges and, importantly, contains moments that reflect who they were, not who they possibly are.

The fact is that people are not searching the past trying to find out who their partner once was, they are afraid of repeating the same mistakes they did in their own past. “Have I chosen wrong again”, “Is this another disappointment?” “Is this person going to hurt me like the last one did?” These are questions not about the partner, but about the self, about unresolved wounds, patterns and fear of trusting. 

Being in that highly anxious state, it is hard to ask the type of question that would bring balance:

“What does the current evidence show me?” If the relationship was mostly good, supportive and stable, does that count for nothing? “Do we allow for human error and the ability to change?” People do change, learn and grow out of past versions of themselves (though it is also true that some don’t). It is also true that people sometimes set such high standards that are no longer reasonable and set others up to fail. 

The first step forward is always inward for awareness. A question like “Am I operating from real evidence or fear?” will give some insight. This is highly important because once obsession takes hold, it can choke the relationship of true intimacy before it has even begun. The paradox here, is often that people do this because they want the relationship to succeed. However, when the emotional and vulnerability stakes are high and feel dangerous, the mind reaches for control, certainty and guarantees. 

If we take this a stage further, we can introduce the term “relationship OCD”, which is defined by the constant need to check, analyse, test and “make safe” a relationship. While many in the medical profession might debate the concept, it is crucial to acknowledge the underlying mechanism: anxiety hijacks the relationship. 

Ultimately, we must confront a universal truth. Everyone has a past. None of us have a right to demand perfection from another person. Fixating on someone’s past reveals more about your own unresolved pain than it does about the worth of a new partner. The decision is clear. Look at what is driving these insecurities in you or walk away from the relationship. 

However, without this work, the problem will just resurface in the next relationship. 

Journalling Questions

1. 1. What exactly am I afraid will happen if I don’t analyse my partner’s past?
      Write honestly. What is the worst-case scenario your mind is trying to avoid?

1. 1. Where have I learned that love equals certainty or control?
      Explore childhood experiences, previous relationships, or moments where trust was damaged.

1. 1. What current evidence exists that my partner is trustworthy and committed?
      List behaviours, actions, patterns — not fears or assumptions.

1. 1. What parts of my own past might be influencing my reactions today?
      Which old wounds are being activated? Which stories feel familiar?

1. 1. Do I expect perfection from my partner in ways I wouldn’t expect from myself?
      If so, where did those expectations come from?

1. 1. How does obsessing over the past make me feel… and what need is it trying to meet?
      Safety? Reassurance? Power? Control? A guaranteed outcome?

1. 1. If I stopped checking, testing, or analysing — what emotional space would open up in the relationship?
      What would you gain? What would you lose?

Therapist Takeaway

When you’re fixated on your partner’s past, you’re not really looking at them, you’re trying to soothe something unsettled inside you. Obsession is a form of self-protection that eventually becomes self-sabotage. The work is not to eliminate curiosity but to recognise when fear has crossed the line into control.

Instead of chasing certainty through investigation, build safety through communication, boundaries, and emotional clarity. Look at the evidence in front of you. Notice whether the relationship you’re in now reflects the fears of your past or the reality of your present.

If you don’t address the insecurity at the source, it will travel with you from partner to partner. But when you heal it, you stop needing guarantees, because you become the safe person you were searching for.