I think the Om-Prinku incident is recent, maybe even the same night as Gayatri's death, but it triggers memories of another incident in the past for Omkara.Why Prinku wants to keep it from Shivaay.. the only reason i can think of is it might have something to do with Dev. Shivaay had made it absolutely clear he doesn't want Prinku to have anything to do with Dev but she still went ahead and Om may have helped her. And something happened.I think its only Prinku who wants to keep it from Shivaay and Om is having a hard time doing it for her. She might have given Kasam or something.😭sound probable?
I think it is much older at least a year or so