why did my dad leave me
He did NOT leave YOU. He left your Mom. Or he left because of his own personality faults.
Dads never leave because of the child, so don't beat yourself up over this. Seek some counselling to help you realize that you are blameless.
With out a little more detail, I'm afraid no one could really answer this question to full potential.
umm...im not sure. you should ask your mom.
Yeah, more details, hun. :)