Eighteen years of together, yet they never married nor had kids. Jon Hamm and Jennifer Westfeldt’s separation was apparently because of their priorities in life and Jon getting sober.

After his treatment from alcohol abuse, Hamm credited Westfeldt for being on his side throughout his ordeal.

Jon Hamm and Jennifer Westfeldt End Their 18-Year Relationship http://t.co/T4rE2RGF8W pic.twitter.com/DEiTubjfaT

— ELLE Magazine (US) (@ELLEmagazine) September 8, 2015

A source told People that Westfeldt supported Hamm through difficult times and hard nights of partying. The source also claims that she had been more like a manager or a mother to him than a girlfriend. And Jennifer grew tired of it.

“He has always had demons and needed a mother figure in his life,” says the source. “It was generally assumed that they would break up once he got sober, because he didn’t need to lean on her to take care of him so much.”

Though they worked hard at their relationship, their differing views on having children had taken its toll.

“There’s always been a rift,” a source close to Jennifer told Us Weekly. “Because he wanted kids and she didn’t.”

In an interview with the Guardian, Jennifer Westfeldt explained why marriage and kids weren’t on her list of priorities.

“In reality our lives, Jon’s and mine, are so unconventional in every way, it’s very difficult,” she said that same year. “I think kids should have something grounded. Jon and I are both children of divorce.”

In another interview with New York Times in 2012, Jennifer acknowledged she’d always thought that one day she’d have children but that life simply hadn’t worked out that way.

“My life has also gone in a million ways I never anticipated,” she said in the interview. “I kept feeling like I’d wake up with absolute clarity, and I haven’t.”

She added that she and Hamm had “a pretty great life together… No one’s had to give up an opportunity they really wanted.”