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Ed Swiderski, hero-turned-villain
When Ed left Jillian's season only to come back and win her heart, he was a beloved hero. But allegations of other women started surfacing and finally he and Jillian called it quits. We're Team Jillian. Boo hiss, Ed.
Then he went on "Bachelor Pad" and turned out to be a bed-hopping lush, with a woman back at home, no less. Wow.