Jon Hamm and Jennifer Westfeldt have called it quits on their relationship after nearly two decades together.

Jon Hamm, Jennifer Westfeldt Split

“With great sadness, we have decided to separate, after 18 years of love and shared history,” the couple said in a joint statement to People magazine. “We will continue to be supportive of each other in every way possible moving forward.”

Hamm, 44, and Westfeldt, 45, were at the center of split rumors earlier this year after the Mad Men star entered rehab for alcohol abuse. However, the two attended the premiere after-party of Netflix’s Wet Hot American Summer: First Day of Camp together on July 22, quieting the speculation.

The couple had also denied that there was trouble in their long-term romance back in April, issuing a statement through a rep that revealed Westfeldt regularly visited Hamm while he was in rehab in Connecticut.

“The story that appeared in this week’s edition of In Touch magazine is not true,” the couple’s rep said in a statement to People. “The only gentleman Jennifer visited regularly in Connecticut was Jon, while he was in rehab. They continue to ask for the public’s understanding and sensitivity during this challenging time.”

For Hamm and Westfeldt, who began dating in 1997, it’s believed that the former’s reluctance to start a family could have been to blame for their split – not his battle with alcoholism.

“Jennifer realized that she and Jon don’t want the same things,” a pal told Star. “So they agreed that it was time to take a step back.”

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