Felt like it lasted: Decades
Really lasted: Three years
Ryan and Scarlett married in a secret ceremony in 2008 and called it quits in 2011. These two kept their relationship so private that they only made one public appearance the whole time they were together. Ryan went on to marry his Green Lantern costar Blake Lively, and Scarlett tied the knot (secretly) with French journalist Romain Dauriac. Both of the actors welcomed baby girls in 2014.