I DONT think KT chooses to be with UP bcoz her BFs restaurant caught fire and had losses. I have read that he does pretty well for himself. That restaurant is not the sole thing he relies on for his livelihood. From previous updates (3 weeks before Up was evicted) in the News and Photo section of the BB8 website, it was once mentioned that KT and UP became very good friends tin the past 3 months and 1 day UP as a friend was telling KT that in a relationship one should not be afraid of the other. From all their talks UP kinda sensed that KT was sort of affraid of her BF and felt pressured. So he was advising her then when he had not fallen in love with her. Their relation was first as a friend and then developed into liking and then love. In one of the episodes when UP almost told her that he has no control on his heart and mind (voiceover in actual episode) and KT at the end asked him "Is there anything else I need to know" and then the same or the next night when UP and Dimpy were talking in bed, Dimpy herself was telling UP that "we both know KTs BF is extremely possessive".
I feel UP wanted to express his feelings completely to KT while on the show but least did they both know that UP would be evicted the very next episode. After coming out of BB8 house, I guess he must have missed her more and realised where she stands in his life. He had constantly been retweeting pics of both together.
Now everyone says that this is scripted and the romance is a drama. Couldn't have UP waited for a month till KT is out to tell her that? But guys, I feel that something did happen outside. I mean between UP and KTs bf. there were rumours that he made a call to him. I am assuming that UP would have got some msg direct or indirect that KTs bf would not want to go ahead with KT after watching BB8 and may be knowing this UP may have thought of taking the opportunity to get back in BB8. and ofcourse why will the channel not want it. after all their TRPs have been the highest this whole week in the past 3.5 months. Also in Friday's episode when Gautam passed a comment on KT regarding getting KT and UP married on the show and inviting her BF for it, UP said that let Gautam say whatever and if UP speaks for just 2 mins (meaning if he discloses something) then he can shut everyone's mouth in the house.I think KT doe not want UP to get mention anything on the show probably because she would want to have a proper face to face closure on her previous relationship.
Also, look at KT and UP's faces and their reactions and smiles when they talk to each other. That is not acting. If it was they both wouldnt be struggling to get a good movie offer and also would not have been in BB8 to promote their careers. So their LOVE seems very genuine and real and hope it lasts forever :)
Also, some additional info from LF, the whole of Thursday (since the task was already over and after Dimpy's Tabadla), Dimpy was seen separately talking to Rahul and then Sam and Sana regarding KT leaving her bf and accepting UPs proposal because of KTs bf having financial losses and thus meaning that KT is only behind money. Now this is the same day when Sam confronted KT about her feelings for UP (and was shown to us as Friday episode). And that is why Sam and Sana also started thinking of KT very badly. But the very next day, i.e Friday morning, the wake up song that was played was "Le jayenge le jayenge dilwaale dulhaniya le jayenge. Reh jayenge reh jayenge paise waale dekhte reh jaayenge" No why do you think this was played. More than us BB8 guys know how much KT and UP love each other and how genuine it is or not. I feel it was like a reply to what Dimpy was doing. And just after the song was over, in LF I saw KT, UP and Mehek talking in the bedroom. I also heard Up telling that he will become 10% more romantic with KT. and that is the same convo that was shown in Saturday's episode in the beginning. If you notice in yday's episode, UP was singing the same song and then the whole convo between UP, KT and Mehek started and then later when Sam was teasing UP and KT in the bathroom (UP and Pritam had face masks on)
So even the channel guys know that their love is true and that KT is not leaving her bf for money.