Sacrificing only comes when both Parties are still in love means...If Prashanth Still loves Aarti and If He May Explain it clearly to Yash and Aarti then Yash May think of Sacrifice but here Prashanth wants Aarti to get rid of his loneliness..Thats it..
.So I think He Will Stand by Her...but He Feel Cheated by Aarti at Very First...and He gives his Hand to Aarti when He knows How She was trapped in it and Abt Prashanth Evil Intentions... So There is No Route for the Story to Move Sacrificing Route...
.But Need to wait for New Year to get to see Supporting Yash For Aarti...