It happened on a Tuesday. I was in bed with my partner – a man I love, a man I chose, a man I have no desire to leave – and suddenly, unbidden, unwanted, my brain served up a vivid memory of my ex. Not a memory of our relationship. A memory of his body. Of something he did. Something I had not thought about in years. I felt the heat rise to my face. I felt guilty. I felt confused. Did this mean I wasn’t over him? Did this mean something was wrong with my current relationship? Was I a terrible person? The answers: no, no, and no. Here’s what’s actually going on when your brain serves up an ex during a private moment.
Your fantasy is not a wish
This is the most important thing to understand: fantasising about something is not the same as wanting it to happen in real life. Your brain is a vast library of sensory memories – some good, some bad, most neutral – and during arousal, it pulls from that library without consulting your conscious values first. A fantasy about an ex is rarely about wanting that person back. It’s about wanting to access a particular feeling – a feeling of being desired in a specific way, of being seen in a particular light, of experiencing a sensation that memory has encoded as pleasurable. The ex is not the point. The feeling they gave you is the point. And feelings are transferable. You can have that feeling again – with your current partner, with yourself, with someone new. You don’t need the ex. You need to understand what the ex represents. That’s the real homework.
When to worry – and when to let it go
If the fantasy is occasional, fades quickly, and causes guilt but not obsession – let it go. It’s normal. Your brain is just doing what brains do. If you find yourself fantasising about the ex constantly, comparing your current partner unfavourably, or feeling more emotionally connected to the memory than to the person next to you – that might be a signal. Not about the ex. About something missing in your current relationship that needs addressing. But the occasional intrusive ex-fantasy? That’s just your brain’s highlight reel. You don’t have to watch it. But you also don’t have to feel guilty that it played.
Your fantasies are not instructions. They’re information. Listen to what the ex represents – not who they were. The answer is usually about you, not them.
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