The pair, who met on the set of "Slumdog Millionaire", - split after six years together.
Dev, however, said they are still close and he will always cherish memories of their relationship, reported Femalefirst.
"Oh, she's great. She's awesome, dude. She has been one of the most impactful people on my life. We shared a very beautiful experience together not only cinematically but personally so I'll always have great respect for her," Dev told Times Weekend magazine.
Currently Dev, 25, is enjoying the single life, dividing his time between his new home in Los Angeles and his family in London.
"I'm a ball of energy. If I'm not asleep, I'm going at full speed at everything. Sometimes I need someone to say, 'Bro, you need to take this seriously and focus'. I'm not really thinking about relationships or family or kids. I'm just a regular guy who spends weekends hanging out with the lads," Dev said.
"I don't go crazy and I am not very celebrity-minded. I am very grounded because, actually, acting is hard work. It's early mornings on set and then plenty of concentration.