Miley Cyrus admitted that she dated Nick Jonas for two years in an article in the September 2008 issue of Seventeen Magazine:
"We became boyfriend and girlfriend the day we met. He was on a quest to meet me, and he was like, 'I think you're beautiful and I really like you.' And I was like, 'Oh, my gosh, I like you so much.'"
"Nick and I loved each other. We still do, but we were in love with each other. For two years he was basically my 24/7. But it was really hard to keep it from people. We were arguing a lot, and it really wasn't fun."
After they broke up at the end of 2007, Cyrus tells Seventeen, "At first I bawled for a month straight. I was so sad. I just went into this weird funk. And I dyed my hair black. When we were dating, Nick wanted me to get highlights – and so I did that, and I got myself looking great. And then, on the day we broke up, I was like, I want to make my hair black now – I don't want to look pretty; I want to look hard-core. I was rebelling against everything Nick wanted me to be. And then I was like, I've got to be by myself for now, and just figure out who I really am."
Miley also told the magazine, "Maybe he'll be my best friend for the rest of my life or maybe I'll end up marrying Nick Jonas!"
Source: Seventeen Magazine via Perez Hilton.