Ok I did some research over the net and found so many articles on this...
So I came to the conclusion that :
Dhoni first noticed Deepika nad even asked SRK to introduce him to her. He also invited her to his T20 matches. He told his friends that he likes her but then Yuvi came into the pics and Deepika was seen with Yuvi many times. Even when she was in Autralia shooting for BAH with Ranbir.
So this whole thing is little bit confusing...Did Dhoni walked away as he saw Yuvi was interested in Deepika?