“Mad Men” star January Jones and ‘Saturday Night Live‘ comedian Jason Sudeikis have decided to end their relationship, a source confirms to People.

“They’ve been on and off for a few months and then the long distance kind of ended it,” the source says. “But they could get back together. It was just hard to stay together with the distance.”

January films her show in L.A. while Jason films in NYC, plus January was away filming for the new “X Men” film, as well.

Jason and January have been dating since approximately August.

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