Actually Gautam seems emotionless while Anita called off this marriage.. Did he really loved Anita? I mean if he agreed to marry Anita only for his Dad's selection/wish?
He is all okay, if Anita doesn't want to marry him.. He simply said, Okay you can go! He didn't try to convince her that he will surely earn and put his all hardwork to save her and his family.. I mean if someone loved really then they will try to save their love n! For Anita, we know that she is/was only after the Shop! But for Gautam..!!! I think he only agreed to get married to Anita for his Dad only.. Not because he loved her!!! Because Prafulla's hubby somewhat tried to convince all and tried to convince Anita too toake this Marriage happen.. But there too Gautam stopped him.. Does really Gautam wants to Marry Anita really?
Also! Marriage happens in a Grant way.. So in most of the marriage happens like this only.. I have heard many stories/in read newspapers.. that Groom/Bride eloped, So in Mandap itself their parents find New Bride/Groom for their respective Daughter/Son.. It happens mostly in India..
It's true too somewhat in India which ppl believe, if once Marriage got called off its a bad omen and they will never get married.. But it's not that true in the all cases.. But society all the time points out it if the marriage got called off.. Because our society is such like Prafulla's mindset..
So mostly parents try to find new Bride/Groom asap in that Mandap itself if anyone is unmarried then they will get.. Here they are showing the same in the show too!
You are right Gautam was not in love with Anita. Agar hota to shadi bachata nahi balki aur hurt hota shayad gusse mein vo bhi kuch bol jaata. To uska reaction itna calm nahi hota as when u love u automatically have lots of expectations from your partner jo G ko abhi nahi thi is liye uska reaction mild tha.
He was calm because Anita ke drame se Anita ki sirf perfect image tuti uska dil nahi toota aur usse realize hua ki she is not the girl jo uske liye bani hai. I am sure agar iske baad A aati bhi to vo khud mana kar data.
Ab uske saamne Anita ek aesi ladki thi jisne apni shaadi se sapne jode the vo toot gaye aur vo gusse mein bol rahi hai.
Tabhi he just stopped her from badmouthing his brothers and Dhara and asked her to direct her anger towards him.