>>42455181
Many reasons
Mom was a spiteful bitch and after I turned 13 that mean the tax refund she'd get for having me as a dependent would be less than the expenses considering the child support that she was also getting is what paid for her motorcycle, wine, and sushi nights.
It was more profitable for her to drop me off at Dad's and then search for a new dumbass man to take care of her and my little sister. Apparently right after I was moved to my dad she went and got rid of all the me-related keepsakes and baby pictures.