When DIO was just a child, he watched his father physically abuse his mother til she died. And that was DIO’s breaking point, he killed his father to avenge his mother and that’s how this all happened

(1987 present time) DIO and Jotaro were battling. DIO was about to stop time using ‘THE WOLD’ though when he stopped time he saw your soul for a split second. And it shattered his heart…