Thank you so much War.
Ok, I've been working on it and I think it's a lot better now. I feel like it's shortened in the end, and more descriptive. So I followed both your advice

But I have a feeling that it's lacking something still.
Who is it that I know so well?
My mind, my heart? I cannot tell
Which one of them will explain why
you left me here with no goodbye
Will either soothe and comfort me?
Or will they curse you bitterly?
Will Mind ask me to turn away?
and Heart argue 'do not obey'?
Yet Heart and Mind cannot ignore
my useless grieving anymore
You left me alone, selfish man!
To find you I'll run, like you ran
Kiss you, love you, leave you to rot
You won't forget like I forgot
But we both know that we'll both find
ourselves, our love, our piece of mind
For Heart and Mind can't be deceived
I'll find my soul once it's retrieved
Only Soul lurks behind and cries
'You found me my mate!' and then dies