I've spent hours of my life researching past Jonas Brothers relationships trying to come up with a comprehensive Jonas dating timeline.
Nick Jonas and Miley Cyrus: 2006–2007 and maybe again in 2009
Nick Jonas and Selena Gomez: off and on and off and on from 2008ish–2010
Nick Jonas and Delta Goodrem: 2011–2012
Nick Jonas and Olivia Culpo: 2013–2015
Joe Jonas and AJ (from Aly & AJ): 2005
Joe Jonas and Taylor Swift: 2008
Joe Jonas and Camilla Belle: 2008–2009
Joe Jonas and Demi Lovato: a few months in 2010
Joe Jonas and Ashley Greene: 2010–2011
Joe Jonas and Blanda Eggenschwiler: 2012–2014
Joe Jonas and Gigi Hadid: 2014–2015
Joe Jonas and Sophie Turner: 2016–now
Kevin and Zoe Myers: date unknown
Kevin and Danielle Jonas: 2007–eternity