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Jennifer Aniston wanted to take it to the next level -- but actor Josh Hopkins didn't!

A source tells the new Us Weekly (out now) that Aniston, 41, and the Cougar Town star, 40, began casually dating in May after meeting through Courteney Cox, her BFF and his costar on the ABC comedy. Before long, Aniston "wanted a relationship. And he was like, 'No, thank you,'" the source says.

Hopkins is "a player and is into meeting younger girls," the insider adds. "He definitely lies to girls."

The actor (who romances Cox on the series) even has a raunchy nickname for Aniston, with whom he was spotted sharing a flirty meal at West Hollywood's Madeo Sept. 2. "Josh calls Jennifer his 'sport f--k,'" a Hopkins pal tells Us, adding that the duo were simply "friends with benefits."

Hopkins has been careful to publicly deny a romance with Brad Pitt's ex-wife. Asked about his dinner at Madeo with Aniston, he told Us, "We were just friends having dinner." (That talked-about meal turned out to be their "final date," the source adds.)

Aniston, who famously dated John Mayer, isn't crying.

She "likes her life the way it is," a source tells Us. Her type? "Really good-looking a--holes."

Read more her about Aniston's secret summer-to-fall flings with Hopkins plus two other men (a Lindsay Lohan ex and an actor in the midst of a divorce) and much more in the new Us Weekly, out now.