Los Angeles: Teen pop sensation Justin Bieber has decided to keep mum when asked about his split with girlfriend Selena Gomez.
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`.