’’ I understood the first three times you told me. ’’ is like after telling you three times , you already understood . ’’ I understood after the first three times you told me , no need to tell me again and again The first 3 times or , maybe , the first 4 times when i was in Bangkok , i didnt like it , but now i do

It means you have told them four times, but once was enough. They are slightly frustrated to have been told four times, they wonder why you don't realise that they understood already.