Pink and Carey Hart’s relationship is full of more ups and downs than a motocross track. The singer and professional biker met in 2001, and their on-again, off-again romance has inspired several of Pink’s biggest hits. They have broken up twice, have two kids together, and are currently going strong. But without the struggle, we wouldn’t have songs like “So What” or “Just Give Me a Reason.” Her two most recent albums, 2008’s Funhouse and 2012’s The Truth About Love, are both heavily influenced by Carey. Read on to get some context, and find out what she’s said about the tracks.