Originally posted by: peacenfun
I felt that too, that there is more than just jealousy though his expressions only conveyed his jealousy or some helplessness too
Maybe as a guy he isn't liking all this flirting & extra attention that Aneesh is showering on Monu & Monu being so sweet & cute taking it all as just healthy flirting but Karan clearly understands that Aneesh expects more, so he wants to warn Monu of spending time with Aneesh in alone like 'beware, just don't trust him blindly because he was your friend once, so be watchful, don't ignore the red flags'
'itna bhi bharosa mat kar yaar uspar, thodi aankhein khuli rakhna'
That's a very good and likely interpretation.
I really feel this statement is some sort of foreshadowing for future track. Yeh aise beech mein daalne ka kuch toh point hoga.