Nick Jonas and Olivia Culpo have not appeared together since last month, but the couple has stayed together despite their busy schedules.

Jonas and Culpo attended the Billboard Music Awards together on May 17. In the meantime, the "Jealous" singer has been touring around the country, which has kept him away from his girlfriend of nearly two years.

"They have not broken up," a source told E! News. "Like any couple they have their ups and downs, but their foundation is really strong and they love each other."

Jonas confirmed his relationship with the former Miss USA during an interview with ABC News on Friday.

"It's good. The long distance is always tough and dealing with that is always an interesting thing but it's all good. You know, we're both busy and young and enjoying life, and it's going well," the 22-year-old singer said.

He and the 23-year-old Culpo were both spotted in New York City this past week, although not together. Jonas will headline the Pittsburgh Pride celebration tomorrow, replacing the previously announced Iggy Azalea who canceled her performance after the Pittsburgh City Council president accused her of homophobia.

"When I heard about the difficult position Pittsburgh Pride was in just days before their event, I knew I had to find a way to help," Jonas said in a statement. "I'm excited to do what I can to support the LGBT community in Pittsburgh, and I look forward to seeing you this Saturday as we celebrate together."