Dosti means Friends Forever = Sam and Neil / Sam and Radhika
Yariyaan means Friendships = Radhika is 1st Sam's friend then becomes Neil's friend and now Arjun who only wants to be close to Sam will be thrown into the circle of friendship with everyone... but before all that, Arjun was Sam's friend 1st, the oldest friendship between all of them.
Manmarzian means Desire = Arjun desires Sam, despite plans of revenge / the desire for revenge against Sam, either way Sam is always within his radar. Sam craves her mother's affection and forgiveness. Radhika desires independence and Neil feels this constant urgent need to protect Sam.
The dialogue during Arjuns khatarnak act with Radz, he says he has been waiting a long time for this moment (with Sam) and he won't let go of her...he always goes back to stating this in many different ways, about not letting go of her, coz if he lets go then she will run away from him, it keeps nagging me (I think when he was younger he always saw himself as belonging to Sam, and vis a vis perhaps when they were teenagers he faced rejection from her and is a lover scorned and this time he is not letting her slip through his fingers again) or he is just using the attraction between them for his great Revenge scheme.
The dynamic between Arjun and Radhika does not give off good vibes. We all have that 1 friend who is skeptical about their friend's new interest...and Arjun appears to be diabolical in nature, more, than the hero type, he could be a threat to Radhika because she causes a risk to his plan if she is always watching his every move.
Chemistry between SamArj is palpable, they ooze sex appeal together...the build-up between the 2 of them is something that cannot go unnoticed.
But Sam even though she is rendered stupid by Arjuns charm, she is still a feisty chica who gives as good as she gets...I love how real she is!
Arjun is definitely going to fall in love with Sam properly by peeling away her layers that Radhika is going to support him with.
I think the PH is playing with the dynamics of the characters, as in testing everyone's chemistry with each other before the jodi's get cemented in our hearts, also audience feedback plays an integral part, and with SamArj fans and RaNeil fans set in stone, I think we just have to wait until they finish their quota of "already shot" scenes
If I had to compare this friendship to anything then let's say Vampire Diaries, bear with me Im still getting over the season ending...
Neil is Stefan - the good brother
Radhika is Caroline - good and pure and always sees the good in people
Sam is Elena - family issues have messed her up
Arjun is Damon - bad boy in need of redemption
Stefan and Elena happened for a while but she couldn't resist Damon and her heart was never the same.
Sam and Neil are friends but her attention is captured by Arjun.
Damon used Caroline for a while there, now they are Frenemies.
I can see Arjun using Radhika to further his ends to get closer to Sam; His Goal.
But it's typical to want Damon and Elena to be endgame, good girl and bad boy...and Stefan and Caroline are besties turned lovers.
SamArj and RaNeil = Delena and Steroline
PS
Remember consumers establish a brand, Android phones are only increasing in sales because of peoples preference for it over Smartphones, that ruled previously, likewise, the more we consistently emotionally connect to SamArj and invest on our choice of jodi, then no other option but TPTB ensuring their popularity is maintained.