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It's Over! Jon Hamm & Jennifer Westfeldt Split After 16 Years

2014 new york stage and film winter gala

Say it ain’t so! After 16 years together, Jon Hamm and girlfriend Jennifer Westfeldt are going their separate ways.

“The relationship just ran its course,” says a source close to the couple. In fact, the once inseparable duo haven’t been photographed together since January, before Jon entered a 30-day rehab program for alcohol abuse.

READ: Jon Hamm’s Secret Dark Past

But it wasn’t the 44-year-old star’s addiction that brought on the breakup— it was Jon’s reluctance to start a family with the 45-year-old actress. “I don’t have a driving force to have a baby,” the actor has previously said. “That said, I’m in a committed relationship, and if it ever came up, I’m not ruling it out.”

READ: Jon Hamm What Drove Him To Drink?

However, sources say he did just that. “Jennifer realized that she and Jon don’t want the same things,” says the pal. “So they agreed that it was time to take a step back.”