Dhruv had many clues to guess that Dev was deeply in love with Kaajjal !! He had many oppertunities to confron him wish he had made use of it !! epsically when the havan took place @ DPS's place for his anger controll and evening Dhruv came to find out why he throw Kaajjal out f the house he had the best oppertinty to find out regarding his beaviour towards Kaajjal but Ameesha put her beak in the converation!!
I think Dev did loose a good friend like Dhruv since he wud have stayed away if he knew earler itself that Dev loved Kaajjal!!! Even forcing her to marry @ the temple wud'nt have taken place!! Also Dhruv shud'nt have consulted Amesha she is a major hand in spoiling Dev and Dhruv;s friendship !!!đĄ