What should I do

Is it stupid to be waiting for someone to come back into your life?

Someone you were drawn to but you knew right away wasn't right for your life, who you are and what you do.

An attraction that felt good, that made you inhale every little smell; hear every sound like they were the only one existing. And now there is nothing you can do to forget them, nothing to erase the good feelings that were floating into your body at that time.

You know this person wasn't good, at least not for you, and after a while the curtains of love one time spread out onto your eyes come out and reveal you the truth, the so very cold truth. 

At first you get mad, you mostly get mad at yourself for not realizing it at the beginning cause you are sure it would have spared you from suffering inside, cause no one had to know, you knew this person wasn't good for you.

But you took the plunge and now you realize you dived into an empty pool, the only liquid you can find now are the blood you lost from hitting the vacant pool and the saliva you spat all through the journey of getting to know and love this person without exchange of any sort.

So, do you think is wrong to still want this person in your life? Is it wrong remembering only the good things? Should i focus on the bad side of what has happened and go on hating or forgetting this person or should I grasp to the good memories?