Mumbai: Star-crossed lovers Shahid Kapoor and Priyanka Chopra have added yet another break up to their constant on-off two year relationship.

The break up happened almost two weeks ago when the couple got into a huge argument and decided to part ways.

Both of them, for the first time in their relationship, were close to going 'official.' Their appearance on ‘Koffee with Karan’ was the first step in that direction.

But soon after they took several steps backwards. Always a volatile couple, their fight and arguments had multiplied lately.

The last time, it was Shahid who called it quits and this time it was Priyanka.

A source close to the duo said, "The biggest problem between them was lack of communication.”

According to the source, “Shahid shooting non-stop for his dad's film, gets completely involved with his work, and forgets everything else which isn't easy for any girlfriend to deal with. This led to a lot of squabbles between them. What made it worse was that after every fight, he would go into a shell and refuse to talk about things. She would try and reach out, but he would put her on ignore alert, blocking her out completely."

“Finally after their last fight he decided to end to their relationship without even letting her know. Things got really bitter, he stopped taking her calls which became extremely frustrating for her.”

“She even landed up at his doorstep but was turned away. That was the ultimate humiliation."

It is now being speculated whether Priyanka will attend Shahid's birthday party on Friday. He has invited everyone and wants to make it a grand affair. But Priyanka is off to New York with friends.

The common friend said, "Staying away from the country gives a good alibi to not attending his party. She's having a good time on her own and trying to keep her chin up."