He saved you, mattheo riddle saved you, your enemy. Heres what happened, you had got the dark mark, but you didn't wanna be a death eater. So you refused to become one. So Voldemort was about to kill you until mattheo walked in,

"don't." He says to Voldemort. Voldemort stops. Mattheo casts a deadly spell on Voldemort, he grabs you in his arms and walks off.