Like a delicious after taste. You already had the smooth creamy velvety chocolate. It's gone. Now licking your lips may bring back some faint memories; but the memory never equates the reality of what it was.
So is some of the experiences in life. At the time they were sweet, desired, happy, wanted. But the experience was time-bound despite your ignorance.
Now, all remained from it is the memories. Some make you smile. Some make you sigh. Some make you shiver.
There is no such thing as everlasting chocolate.