He is definitely in denial mode!!! He is confused about his feelings...he has started liking appu and these childish acts as well...he is just trying to act matured and all bas that's it!! His personality is changing being with appu....and he is not able to digest the fact that he is changing thats it!!!
This is highly impossible to happen in serial....but i so want appu to get upset at this and go to her dad's place and this lover boy acting as a teenager and going to meet her like from window or something....but appu would definitely not meet him of he goes directly!! This is very high imagination of mine...i know this is not happening in serial ...but i so want this to happen...so that Shashank starts realising that he is actually changing and he is liking the change as well!!
I don't see this happening anytime soon🤣but we can definitely hope to get this in future, agar hua toh bohot maza aayega