David Alejandro wanted to quit. Jon Romeo would not let him. Alejandro, 43, a visually impaired runner from Naugatuck, was attempting to run his first Boston Marathon on Monday. Romeo,…

MIDDLEBURY — Naugatuck’s David Alejandro has run three New York City marathons, two Hartford marathons, duathlons, triathlons, road races, even a full triathlon of 140.6 miles and a half triathlon…