Courtney Robertson Returns Engagement Ring After Ben Flajnik Split

Courtney Robertson arrives at the "Night Of A Billion Reality Stars" Bash on March 29, 2012 in Los Angeles, California. Gregg DeGuire/FilmMagic

With this ring . . .

Courtney Robertson put the final nail in the coffin on her relationship with Ben Flajnik on Sunday, returning the 3-carat, $80,000 engagement ring he gave her on the finale of The Bachelor last fall to the Neil Lane jewelry boutique in Los Angeles.

(On the ABC reality series, show producers foot the bill for the rings, and contestants are obligated to return the jewelry if and when wedding plans are called off.)

Following one of the most controversial Bachelor courtships in history — she was catty, he cheated — the California winemaker, 30, and the L.A.-based model, 30, announced their split Oct. 5. "We grew apart," Flajnik told Us. "We realized it wasn't working."

Robertson made quick work of rebounding — caught making out with Bachelorette castoff Arie Luyendyk Jr. last week — but an insider tells Us Weekly her feelings for Flajnik were real.

"Courtney was in love with Ben," the pal says. "She put a lot of work into that relationship — him, not so much."

Eventually, a second source explains, "She ended it."

As Robertson dives back into the dating pool, a Flajnik pal adds that "he'll date again soon" as well. "He's approached by girls all the time!"

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