the girl was from the triators side and she wanted navin to fellin love with her so that she can take some valuable info from navin and the same happend but even rajveer started loving her and he got hurt when he heard that navin loved him (he told raj on the phone in flashback when naina ased raj kya bhiya bhi kabhi bhatke they) after this when that girl took out the valuabe info from navin she must have blamed navin for that and flew away herself .
she must have contacted major bharjav for this as he wanted his promotion that time at any cost (remeber he was teling ali his father was a subedar and also ki position ke sath ati hai beiymani) andthat girl not knowing that raj knew all this or not she took raj's name too . and therefore major bhargav sent him with navin so that both ek hi sath khatm ho jayen and during the time they were in the van going to jail (jk) navin told him the story and raj must be feling bad as he love that girl only and might have helped her unknowinglly. now he must be feeling guilty for all that and not teeling the truth to naina . (amd this is why navin wrote in his last letter ki agar mujhe kuch bhi ho jaye to raj se poochna.
whta say??????????????????😕