i dont know but my gut feeling might be saying me its
1) either Mani is too involved in the game somehow i dont know how but as he has agreed to sign some contract with Ashok when he marries Shagun ... i dint know but i feel when once Ishita heard in Mni/s party about Ashok intention of not marrying Shaggu , then how come Askok known Mani as beforehand? Another reason if you remember Suraj-Ashok track where they were supposed to call some relative which will effect IshRa... and one more when Ishita was calling Raman Raavan kumar in her clinic and Mani appeared there and he guessed to Raman calling he Jhansi KI Rani...how he would guess that ...i think this is all a plot and also Mani challenging Ashok to marry Shaggu as he knows he will do opposite ... i think all is being planned and well plotted and even the IshRa MU... was created intentionally
2) might be Mihir too involved as we all know he is Shagun brother... so how come he will not revenge this with Raman . We know and he knows too that Shagun left Raman , maybe she married him for wealth but he was a loser, right... so this is not possible and thus he may believe that Shagun was not getting Raman's love(sorry not possible this too...) he must be believing that Raman could not give time to Shagun thats why she left him... and now showing himself with a big heart in front of Raman...
I maybe wrong but my thesis and point of view is solely based on the shows point and since its an Ekta show and to keep the story flowing... villains need to be extracted out from time to time to keep show flowing for years...as its a Ekta TV show primarily and we can expect this ...
So what do you feel?
NOTE-- on a personal front i want toofani twist be somehow related to Bala and Vandu's life as Bala was shown having condom in his pocket...he excused this as he found it in a student bag... but i doubt it...so i want bala's deeds to come out as toofani twist but its highly unlikely as it is impossible to turn of events in ashok-shagun marriage but it can turn IshRa's lfe...