This is some cosmic connection in Ishita's language. I don't know how they both do it. Some people are meant to be together; KP DT are perfect example on screen.
I personally believe that the passion in a relationship for each other is what makes it worth dying for and worth living for.
The rage,the anger, the feeling that he/she should claim me, he/she is mine; that's perfectly portrayed in last few episodes and if Mani is the reason behind it then I surely don't mind. Because by the end of the day what I see my babies madly,deeply and passionately in love even after MU.