Here is why. A source of Mumbai Mirror tells that things has become very sour between Ranbir and Katrina. Reportedly, the actress is pressuring on marrying Ranbir and starting off their marital life, while Ranbir is not yet ready for marriage.
The source also informs that his closeness with Nargis has increased because of Katrina's demand on getting married by March 2012. Reportedly, Katrina clearly told Ranbir that in one years time they will tie the knot.
When Katrina discovered the rumours she was upset and told that these are rotten piece of information, which are miles away from the truth and beyond fiction. The actress told to Mumbai Mirror, “The so-called people close to me who are saying these things actually have no proximity to me Ranbir is a friend, but there is nothing beyond. So there is no question of my breaking up with him or asking for marriage."
Well, Katrina, not all about the information is wrong. If we stress on our memories a little, then earlier in an interview with the same same tabloid you had expressed your desire to get hitched by the year 2012. On the other hand the source went on to say that Ranbir was surprised to hear such a demand from Katrina and denied from doing so as he was too young to get hitched.
Who knows what is the truth, we can only say Katrina to take it slow with Ranbir, who knows he will take you in the same way as he did with ex-beau Deepika Padukone.