Why Ritika Killed Chirag?

Ritika was actually pregnant with Chirag's child and she killed him to take revenge from him for deceiving her.

What happened to Ritika in Meri Aashiqui?

Following the argument, Ritika gets hit by the bullet. Infact, she came in front of Ishani exactly when the shooter released the trigger.

Will Ranveer marry Ritika?

In Meri Aashiqui Tum Se Hi, Ritika (Smriti Khanna) and Ranveer (Shakti Arora) are getting married for the third time. Ritika is now getting married to Ranveer (twice, as before too she was about to get married to him, but was stopped by Ishaani), and Sharman ones (before), so this is third time she is turning bride.