야 그러다

"…," he goes — quoting plain speech

A plain-style sentence ending in 이야/야, then 그러다, which here means "says, goes". It reports someone's exact words with no quotation marker at all: "his limit is three glasses," he goes; "you're not messing the girl around," he goes; "aren't you turning into a super sheep?" 그러다 is doing the job English does with "he was like", and all these lines are casual speech. Be careful, though: not every 그러- after -야 is quoting. In one line 그러니 just means "so", and in another 그러기 points back at the whole preceding statement.

Register: casual spoken