The 'Brave' singer opened up to Details about how his break-up from Jones in 2006 changed his perception of dating.
[Left: Josh Groban / Right: January Jones]
"We dated for about two and a half years, and we were madly in love… It was definitely my longest relationship," Groban explained.
He added: "I'd love to get into another serious relationship. I am a real romantic at heart."
Groban also discussed his complex relationship with Katy Perry, but stopped short of admitting that they ever actually dated.
[Left: Josh Groban / Right: Katy Perry]
"I'm not commenting on that," he said at first, before adding: "We might have skated on the line of dating."
The pair were initially linked when they appeared together at a few red carpet events early in Perry's career.
Groban most recently made headlines for landing a guest appearance on the Valentine's Day episode of CSI: New York.