Sex File: I'm happy in my new relationship, why am I thinking about my ex?

Ever since I saw my ex at a recent event I have found him cropping up in my thoughts, occasionally sexually
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I'm in a happy new relationship, but ever since I saw my ex at a recent event I have found him cropping up in my thoughts, occasionally sexually.Â
Things ended messily and I definitely don't want to get back with him. How do I stop the past from impinging on my future?
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