The pair mutually decided to "separate as a couple," according to Page Six.
"We are grateful for the friendship that we have and will continue to have," the statement concludes.
Williams, 31, and the co-founder of CollegeHumor, 38, haven't been photographed or seen together in some time. have been seen together.
The duo first started dating in 2011 and later got engaged during a viewing party of The Bachelor before tying the knot in a ranch wedding in 2015.