The one I'm in now is at 6 years and 2 months - we did break up for almost a year 2 years ago, because we were at the point where we'd never dated anyone else and started having doubts about being so serious...I went out a few times during the period but no real "relationship" - I pretty much was just still dating him. But we're back together, and happier than ever
Before this one, I dated someone for 11 months, and someone for 3.