How can I stop fantasising about my ex-lover?

I had an affair three years ago. It only lasted a few weeks and I really regret it as it has caused a great deal of emotional pain for my wife and I.

We have worked hard to restore our marriage and been pretty successful in making things work. My problem is that during sex I often fantasise about my ex-lover.

I haven't told my wife, and I don't want to rekindle the affair, but I feel really guilty about these thoughts. My wife is very attractive so it's not that I don't fancy her. What should I do?

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