Dorchester's Steven Banks, 48, was sentenced last Friday to nine to 10 years in prison for slashing the face of his former girlfriend's former boyfriend. According to evidence and testimony introduced at the trial, the love triangle met on Hopkins Street, Nov. 13, 2007. When the woman introduced her former boyfriend to Banks as "one of my oldest and dearest friends," Banks said, " I don't shake hands." After a "discussion" Banks slashed the victim's face from ear to chin and took off in a motor vehicle. The knife was later found by police in Banks' possession. The victim now cannot produce tears in or completely close his left eye naturally, having instead to use eyedrops and wear a weight in that eyelid.