'I was certainly naive,' says Elizabeth Edwards

(CNN) – Elizabeth Edwards, wife of former Democratic hopeful John Edwards, tells CNN's Larry King that at the time her husband was carrying on an affair with videographer Rielle Hunter, she did not suspect him of being unfaithful.

"Did you have an suspicion at any time?," King asks Mrs. Edwards in an exclusive interview set to air Tuesday night on CNN.

"No. No. None," Elizabeth Edwards replies. "He's been on the road for quite some time. He's a lawyer who traveled. He took cases all over. But I saw the way he treated me. I knew the way he treated me, the commitment he had to our family. I was perhaps, the one thing I could agree with Maureen Dowd, I was probably naive, I was certainly naive."

Edwards also tells King that she believes her husband loves her, but fell prey to a flaw.

"I believe through this whole thing, John has loved me," she tells King. "I just think that he had a frailty that allowed him to do something which was completely contrary to the rest of his life."

The political spouse was also candid about the impact that her husband's infidelity has had on their marriage as she continues to live with terminal cancer.

"You know what's double sad, if God forbid you left, John will probably be double crushed," King says in Tuesday's interview.

"I completely agree with that," says Edwards. "We've talked about that. We've talked about his work at rebuilding trust, and it's really important that he get to that place, quote in time so that he understands that what he took away he does his very best job to put back."

Updated: 6:38 p.m.

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Programming Note: Watch Elizabeth Edwards' entire exclusive interview on Larry King Live beginning at 9 pm Tuesday.