She cried her eyes out when Raman went to picnic with Shagun and when she thought Raman had affair with Sanjana. She should know and understand that feeling.
Raman's fault is not to confront her when he saw Manisha name in her phone and I feel he is dealing with it in his own way . Forcing himself on her is kind of OTT and very unlike our RKB. Could have been avoided but I was bowled over their performance so much so that I could not bring myself to watch that scene.
I seriously do not get this guy Mani. He clearly knows what Raman's problem is but he never tries to tell Ishita or even hints to her.
Raman's character is the most complex character and it is the charm of YHM. Writers are doing a pretty good job in keeping it interesting.
And definitely none other than KP could have portrayed it so well. He just added his own spice and flavor to it.