The reason for the relationship getting broken was because Ram was getting more and more bothered about the relationship between Rajat and Priya. Even though Ram had always known that Priya had loved him truly, he was getting more and more bothered since he knew that Rajat was madly in love with Priya, and the fact that Rajat was helping Priya in the custody case (including discussions with the lawyer and the effort to ensure that Priya had a strong financial backing) embittered him towards Rajat. It got so bad that he started turning against Rajat, speaking badly to him, breaking his business relationship with Rajat. However, this did not change Rajat's support for Priya.
And then the shooting happened. Ram stepped in to try and prevent Anushka from firing her gun, and in the struggle he was shot (after which Pradeep was shot a bit later). He was rushed to hospital with Priya in the ambulance and was then treated until it was clear that he was out of danger. However, it seems that Ram will remain bitter, atleast in the promos where he speaks bitterly to Rajat, and it is not sure whether anything will change; one thing that will change is the relationship between Rajat and Priya, since Rajat admitted before everybody that he was madly in love with Priya.