The Lost piece in the Puzzle of Life.
Sometimes, regret swallows your happiness. Regret of the Guilty Sins you once committed by hurting a soul for temporary happiness ;
That soul might have been right or wrong but you lost your position in it's mind, an empty space is all that is left now, like that of an almost complete jigsaw Puzzle with a lost piece, you keep looking for replacements and you can find none like the Original.
Although you know very well, what's good for you and what is not~for completing the Jigsaw Puzzle with the Right piece may also ruin your happiness by creating a wrong picture. You may realise that you worked so hard on gaining Nothing !
Decide, even if the picture is blurred, broken or damaged, if it's worth setting everything alright. Not every piece that fits in needs to complete your picture in the right way; it may belong to another puzzle.