After Paula Abdul claimed American Idol producer Nigel Lythgoe got handsy with her back in the day, the producer is floored at the accusations hurled against him. “For years this has eaten at her,” a source dished of the 61-year-old star, who worked with Lythgoe, 74, on American Idol and So You Think Yo Can Dance. “It’s been soul-crushing. She’s always wanted the truth to come out, and she finally summoned the courage to pull the trigger.” “Nigel no doubt was blindsided and didn’t see this coming,” added the source. “He’s denying the allegations, but Paula isn’t backing down. She wants justice…