Rhys Culley, 23, asked pretty Chanttelle Ward if she loved him before he sank his teeth into the 18-year-old's flesh during a kiss.
Culley was jealous and insecure about what his girlfriend was doing while he was working away when he decided to disfigure her.
The attack was so severe, Ms Ward was convinced her top lip had come off.
Jurors at Newcastle Crown Court saw pictures of angry teeth marks in Miss Ward's upper lip after the attack, during which he smeared her own blood around her face and forced his tongue in her mouth.
