Justin Bieber, we can totally understand why you can't let go of Selena Gomez. She's a wonderful person, and she was a great girlfriend. You two had two happy years together, and that's a long time for a couple that was just 17 (you) and 19 (her) when you first got together. Not that many young romances last that long, even when the couple isn't in the celebrity spotlight and having to deal with the stresses of demanding work schedules and almost nonstop travel. She was your best friend and confidant. She understood you and what you were going through.

-- Bonnie FullerBonnie Fuller is president and editor-in-chief of HollywoodLife.com and the former editor of Star, Us Weekly, Glamour, Cosmopolitan and Marie Claire magazines.Scarlett still struggles

Although Ryan Reynolds wasted no time moving on and remarrying Blake Lively after his divorce from Scarlett Johansson, the 28-year-old actress admits she's still learning how to move on. "I continue to get to know myself better as I get older, and that helps me in my relationships," she tells Marie Claire in the May issue.

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