According to a The Times Of India report, the Khan family are certainly unhappy with their friendship. The media report also mentioned that Arjun's father - filmmaker Boney Kapoor - is also not happy with his son's relationship.
Boney asked Arjun to 'maintain distance' from Malaika as he thought it might affect his Bollywood career. The main reason presumably is that the junior actor cannot afford to take on Salman Khan and rest of his 'Khandan'.
It seems that Ki & Ka actor has taken his daddy's advice seriously. In the last two weeks, Arjun hasn’t been seen around Malaika’s building.