Fear that experiencing it again may not feel as good as you remember resulting in a forever tainted or less enjoyable memory of it than before.

This could be visiting a park your parents took you to a lot as a kid, a series you enjoyed years ago, or even just that nice restaurant with the friendly staff you once went to with your ex.

Avoiding those experiences preserves the memory as it is and you cannot “ruin” it by trying to relive them again.