"Courtney was in love with Ben," another source added. "She put a lot of work into that relationship -- him, not so much."
Robertson reportedly returned her three-carat $80,000 engagement ring to the Neil Lane jewelry store in Los Angeles on Sunday. Flajnik told In Touch Weekly last week that under contract with ABC, he and Robertson would've had to maintain their relationship for two years in order for either individual to keep the ring. The couple only dated for about 10 months.
Robertson, a 28-year-old model from Santa Monica, CA, got engaged to Flajnik, a 29-year-old winemaker from Sonoma, CA, when he selected and proposed to her during The Bachelor's sixteenth-season final Rose Ceremony, which was filmed in November 2011 and aired in March.
The pair announced earlier this month they had decided to break up and end their engagement. In their split announcement, Robertson and Flajnik -- who had maintained a long-distance relationship the last ten months -- stated they had "grown apart" due to "distance, time apart, and our need to focus on our respective careers."