Ok Misti and Ruhaan has decided to come clean with everyone and thats the right thing to do mainly Veer. Its reasonable why Misti and Ruhaan is happy right now. The episodes was set on one day so everything happebed in a day. So Misti broke up with veer and felt free after that so yah it makes sense she is happy in that moment. Ruhaan got the girl he was silently suffering for so yah he is happy in that moment. This is all in a day. The main test will come when everything comes out in the surface and if the love they both decided to fight is real or just a fling.
But!!!! TAANI!!! girl nahhh girl! That wasn't cute girl! I really hope u made sure there was condom involved if things really did bended that way! Or else I am seeing this track going towards your pregnancy! Girl don't exploit the freedom you are getting. Be careful!