Katy and Rob decided to part ways because she felt their respective work commitments gave less time to spend with each other.
The main reason she split with Russell was because she ended up spending much of her time on tour. "She said dating Rob felt like being with Russell all over again," showbizspy.com quoted a source as saying.
"It's a shame as they both liked each other but Katy wants to be able to have a relationship with someone she isn't constantly having to work out what time zone they're in," the source added.
Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing
Photos: Salman Khan, Daisy Shah spotted at the Mumbai airport
Photos: Rakhi Sawant to play Honeypreet in Ram Rahim biopic
Photos: Arvind Kejriwal asks Kamal Haasan to join politics
Photos: TV actress who played goddesses on the small screen