A lack of transparency results in distrust and a deep sense of insecurity - Dalai Lama
This holds true for both Shravan and Aditya. The lack of transparency from the people they love led to this deep sense of insecurity prodding them to do the things they did.
Let's see what was going on in their mind to truly understand the reasons for their actions.
Shravan: Just when I thought Sumo will be with me forever and its time for me to tell her how much I love her and that she means the world to me...she started avoiding me...she started blowing hot and cold...what did I do wrong?...i have always been there for her and will always be there for her in the future...if there is any issue, she should tell me...I am her Shravan after all...but wait...is there something brewing between Aditya and her?...No, may be from Aditya's side but definitely not Sumo...oh no! Aditya and Sumo are getting married!!...so this was brewing in the past few days right under my nose and Sumo didn't bother to tell me!!...after all the years of friendship and close bond that we share...She just chucked me out of her life and will now get married to Aditya?...she knew that Aditya was Nirmala Ahuja's foster child and still decided to marry him?...does she know how much she has hurt me?...fine, if she does not care about me...why should I?...she wants to get married to Aditya right? I don't care...but if she loves Aditya, why is she hesitating to say I love you to him?...What past is Aditya talking about?...Does Aditya feel that Sumo has feelings for me?...If she does have then why isn't she saying anything?...What's going on in her mind?...If she is not happy with Aditya, why is she marrying him?...and then this Nirmala Ahuja, she is only bothered about Aditya...what about me? Was it my destiny that you left me and now Sumo is leaving me?...you only care about Aditya's happiness...what about mine?...do you see how much I am suffering?...the only one I loved with him heart and soul is going to leave me and go and I cant do anything about it!!!...if i am burning within, i will burn down everyone else with me..
Aditya: I saw Suman on the day of the sangeet and lost my heart to her...I want to marry her...She does not love anyone else - she didn't say anything when I asked her about the "S" in her mehendi that time...I am excited that our families have approved of this alliance...But I am a bit worried at the same time - she doesn't seem to reciprocate my feelings...may be she will love me as time goes by...But wait, will she ever be able to love me the way I love her?...Is she in love with someone else?...Why is there a tense undercurrent in her relationship with Shravan?...If they are best friends, then why are they not celebrating such a big day in Suman's life? Why are they sulking all the time?...Why is Suman least interested in her wedding shopping?...Why is Shravan always bitter whenever I talk about Suman or the wedding?...Is there anything more than friendship between Shravan and Suman?...No...I have asked Suman if she had a past but she has said no but then...why is she behaving strangely all the time...May be I should pester them harder so that they spill the beans...May be she loved him and is over him now... Shravan definitely feels for Suman but does Suman feel the same?...I really need to know if Suman will be able to love me the way I love her...If she loves Shravan, then why is she marrying me?
At the end of the day, both Shravan and Aditya are human and their actions tonight were a result of their insecurities. Applaud the CVs for creating real characters on screen.