I'm thinking the next twist may be Arthi abort the child though Yash accepts her back in his life... I think that's the real love that Arthi has on Yash that, he still loves Arpitha only and Arthi knows this fact and she respects him and loves him...She loves even his feelings also, so she loves his feeling of loving Arpitha and doesn't want to give arpitha's place to some other in his life...
After this Yash will be impressed much on Arthi and loving her much than before(in Mumbai)...
I don't know, but I feel this should happen, this incident may be the beginning of their love life specially for Yash...
Sorry guys, this thought might have irritated u people,,,This is just my Point of view...