Though they were friendly around the time they made the 2004 romantic comedy, "13 Going on 30," Ruffalo said that their relationship fizzled shortly thereafter.
"We had a great time together!" Ruffalo told Andy Cohen on "Watch What Happens Live." "I think we would [have stayed close], but then Ben [Affleck] came on the scene and that was the end of that."
When Cohen asked if Affleck prohibited Garner from having male friends -- a joke -- Ruffalo just shrugged.
These days, it seems both parties have moved on. Ruffalo is starring in a new movie, "Begin Again," alongside Keira Knightley, while Garner was recently honored with a star on the Hollywood Walk of Fame.