There are rumours that the 20-year-old singer-actress and the 18-year-old 'Baby' hitmaker, who went public with their relationship in February 2011, broke up about a week ago, reported Us magazine.
But Bieber seemed uncomfortable during an interview with Open House Party radio host when asked about the split.
"I don't know what's going on in my life . . . To even assess that it doesn't make sense 'cause I have not made any comment," he said.
After performing in Boston Saturday night on his 'Believe' concert tour, Bieber took to Twitter to thank fans for their support during his trying time.
"Thank you Boston. Focused on the positive. 30Million Beliebers with me. I'm never leaving you because you are always there for me," he posted.
Gomez, meanwhile, has maintained a low profile since their breakup rumours. She has recently wrapped up production on her Disney series 'Wizards of Waverly Place'.