Do you know why he would have ended the chat like that?

Back in 2016, after my 10th grade final board exams got over, I was playing video game on my PC and messaged the boy named Akash on Whatsapp who was a year junior me which means he was about to be in 10th grade whereas I was about to be in 11th grade that time. First we said hi how are you to each other. Then he asked "where are you doing +1 +2?" Actually some people here in India call 11th and 12th grade as "+1 +2" which means asked in which school I was gonna study 11th and 12th grade but I didn't know about it back then and also misread his message as "what are you doing now +1 +2?". So I answered him "I am playing GTA 4". Then he replied hmmm. Then I asked him "do you have GTA 5?" Then he said bye and ended the chat. Do you know why he ended the chat like that when I just asked him whether he has gta 5 or not?