The Australian singer, who amicably split from the 20-year-old model in May after more than a year of dating, insists there is no drama between them and he doesn't mind that she has moved on with the former Jonas Brothers star.
He said: ''It's all cool, like we have all mutual friends and stuff in New York. I'm cool about it.
''I'm sort of impartial to the whole thing and try to remain nice to everyone and not cause any bad blood or anything.''
The 'Pretty Brown Eyes' singer was spotted hanging out with Selena Gomez, 22, earlier this month sparking rumours they are dating, but recently stated in an interview that the speculation had made things ''weird'' between them.
The 18-year-old insists he only meant that it was annoying to be linked to one of his celebrity friends.
He told E! News: ''It is kind of [annoying], because on a daily basis, I don't hang out with celebs. All my close friends are normal dudes and then I will hang out with some girl who is a musician and everyone thinks that's what it's all about. Again, I like to be friends with everyone.''