Okay, so the only time you’re gonna see Jack cry throughout the whole season is right here. Remember why?
Lazar tells him about his childhood and that he and his family had been starving. Therefore Lazar used to share his cup ramen with his siblings. Jack remembers that he used to share his cup ramen, too - with Yusei and Crow when they were children.
He feels sorry for Lazar, gives him tons of cup ramen and cries for ages.
Because of fuckin NOODLES.
As a somewhat poor person, I can vouch about how important noodles are.