Alyssa Miller and Jake Gyllenhaal [Photo/Agencies]

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The 'End of Watch' star reportedly ended his six-month relationship with the Sports Illustrated model, 24, last month after they struggled to cope with him relocating to Los Angeles from New York City to film his upcoming movie 'Nightcrawler'.

A source told UsMagazine.com: "They fizzled out. It happened a while ago -- before the holidays. He's back on the scene.

"Things were really good between Jake and Alyssa right up until he had to leave for LA to go shoot a movie [Nightcrawler] in the fall. Then the distance just really got to them."

A friend also confirmed: "They were apart for the holidays, and things weren't good with them even before that. She's very much a long-term relationship girl. He's not as much of that mind-set."

Another source said that Jake, 33, "was very taken with [Miller], but I think their work definitely drew them apart."

An insider added: "I know people are bummed, because many thought he had a chance this time."

The former couple, who started dating in June after they met at their gym in New York, were previously thought to have been getting serious as Alyssa revealed in October that she had formed a close bond with his older sister, Maggie Gyllenhaal, 36, and that Jake had been teaching her how to cook.

The 'Brokeback Mountain' actor has dated a slew of fellow A-list stars in the past including Reese Witherspoon, Kirsten Dunst, Minka Kelly and singer Taylor Swift.