After 18 years of being together, Jon Hamm and Jennifer Westfeldt have ended their relationship.

Westfeldt and Hamm didn’t tell exactly when it happened and didn’t discuss any reasons of the separation but they released a joint statement regarding the news.

“With great sadness, we have decided to separate, after 18 years of love and shared history,” Westfeldt and Hamm told PEOPLE in their statement.

Sad news: Jon Hamm and Jennifer Westfeldt split after 18 years together http://t.co/WxoPrISpef pic.twitter.com/Kv6N2EGsrY

— People magazine (@people) September 7, 2015

Hamm completed rehab for alcohol abuse last February and last April there were rumors circulating that Westfeldt had ended their relationship before Hamm entered the rehab.

They denied the said rumors and Hamm even credited Westfeldt for supporting him all throughout.

Hamm even said in an interview that he is lucky to have Westfeldt in his life.

“Our lives are entwined,” the actor said. “It’s a long time together. I’m definitely the guy that repeats his stories! Mostly it’s just paying attention and keeping engaged and not succumbing to inertia or going through the motions.”

They were last seen publicly last July in New York at the premiere after-party for Netflix’s Wet Hot American Summer: First Day of Camp.

Hamm and Westfeldt began dating 1997 and established a production company, Points West Pictures, in 2009.

Westfeldt wrote and produced the independent film, Kissing Jessica Stein, and wrote, produced and directed the comedy film, Friends with Kids in 2011, in which Hamm also starred.

Hamm played the role of talented but troubled advertising executive Don Draper on Matthew Weiner’s period drama Mad Men, in which he won eight Emmy nominations. Mad Men ended last March after seven seasons.

“We will continue to be supportive of each other in every way possible moving forward,” Hamm and Westfeldt said in their joint statement.

Though they were together for 18 years, Hamm and Westfeldt were never married and had no children.