Upen has been always Gautam's friend but was under the umbrella of Deeps, etc. Now that Deeps is gone, and after today's episode, the question is how fast Upen and Arya would follow others like Minisha to join Gautam's camp.
Upen showed his friendship for Gautam by giving him rose. And now that both Diandara and KT are exposed, Upen should try to break from the group. An example of Upen taking Gautam's side was - that milk episode, when Gautam came to ask Dipps who was asking about him taking some milk, Upen said that Gautam was fine outside, and someone else might have encouraged him to come and talk to all about the incidence - in this manner he kept both sides happy. Upen, you are most there, go grab the opportunity.
Gautam also tried to mend things between Arya and Minisha - so Arya clearly understands that Gautam is liked by many and would/should plan to join him (remember, Gautam offered his hand of friendship to Arya but this mand bhudi never thinks straight). Arya, hurry up before the train leaves the station.
Someone posted a link for Gautam's short movie Darpok selected at Cannes here on IF a few a days ago. I see similarities in his behavior in BB house based on that movie. He started aggressively but has realized that calmness wins more friends.
Cheers!