Whether as love or friends but sana gets angry when Sid don't spend time with her or precisely spends it with mahira,aarti or shefali and to get back at him she spends time with Vishal which pisses Sid a lot and then again to get back at her Sid spends time with mahira,aarti,shefali which hurt Sana and to get back at him she spends time with vishal which again makes Sid angry and so on this continues..they should just spend time with each other ,they will be happy and we will be double happy..we will happily watch even if they spend rest of the days with each other only even without uttering a word to anyone else..how much problem Sana has with this jealousy word but in my opinion she indeed is insecure not just from Mahira but simply from all the girls around Sid and not because they are stronger or better but just for the fact that she don't want to share Sid's attention with anyone..Sid on the other hand has this notion that she is trusting Vishal,shefali ,Asim etc over him and it pisses him and it could actually be totally solved if he start pampering her like earlier where he use to run behind her and nothing extra has to be done but Sid now is not in that mood because somewhere he thinks that he is just a source of entertainment for her who helps to remove her boredom..he thinks that Paras still affects her because of her issues with Mahira..he can't contemplate that it could be due to him too, maybe the concept of Sid prioritizing mahira over Sana is totally alien to him..this is so absurd that he can't even get this to his head..he is not realizing what his actions looks like to Sana and he can't even fathom that concept to actually work on it..whenever he tried to sort out Mahira Sana issue ,he had said it's between you three,maybe he doesn't realize that "he" is also involved and infact is a major reason of it..all he had to do is clear "himself" regarding his priorities in detail and things will start getting better..
Obviously these are just my prediction and reality could be totally different... seriously these "expectation" are creating lots of issues between themđđ..pehle na toh koi expectations thi and na hi complaints..