January Jones and Will Forte have decided to call it quits after only five months of dating.

A source tells Us Weekly that the couple, which first met on the set of their post-apocalyptic show "The Last Man on Earth," actually ended their relationship last month.

When the two first got together, a source told Us Weekly, "He's a good guy," and that the pair were "having fun" together.

Sources close to Jones say she isn't looking for commitment, which is why she isn't completely sold on being with Forte at the moment. In the past she's told friends "relationships are a pain in the ass."

Both Jones and Forte attended the 67th Primetime Emmy Awards in Los Angeles on Sunday, Sept. 20, and they managed to avoid running into each other at the ceremony and after parties.

The 37-year-old actress, who plays Betty Draper on "Mad Men," celebrated Jon Hamm's win for Outstanding Lead Actor in a Drama Series for his role of Don Draper. Hamm also recently went through a break-up with his longtime girlfriend Jennifer Westfeldt after spending 18 years together. Despite their split he thanked Westfeldt in his acceptance speech.

"Mad Men" was also nominated for several other categories, including Outstanding Drama Series, Elisabeth Moss for Outstanding Lead Actress in a Drama Series and Christina Hendricks for Outstanding Supporting Actress in a Drama Series.

Forte, 45, while nominated for Outstanding Lead Actor in a Comedy Series for his role on the Fox show, unfortunately lost the award to Jeffrey Tambor for his role in "Transparent."

While Jones is busy with her acting career, she also is a mother to 4-year-old Xander, whose father's identity remains a secret. In the past the actress has been linked to director Noah Miller, Jason Sudeikis, Ashton Kutcher and Josh Groban.