The boyfriend of the woman who police say was abducted while talking on her cell phone says he had nothing to do with her disappearance and he believes she's still alive.

Douglas Davis told FOX News Thursday that he thinks that Kristi Cornwell's faith and strength will get her through the ordeal.

"My heart just won't give up," he said. "I won't give up. Neither will her family and friends."

He said on NBC's "Today" show that he believes 38-year-old Cornwell is OK because she is a "fighter."

Davis was talking to Cornwell on Aug. 11 when he overheard a struggle as she walked near her parents' home.

"I know she was frightened," he told FOX. "I know beyond the shadow of a doubt that she was being abducted. We were talking and she said, I need to get out of the way; there's a car coming."

Davis said he couldn't elaborate on other details of their conversation. Police have said he heard her pleading with her apparent captors, "Don't take me!"

Cornwell is the mother of a 15-year-old son and formerly worked as a probation officer.

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Authorities called off the ground search for Cornwell Wednesday after nearly eight days of combing parts of a three-state area.

Davis urges his girlfriend to "hang onto your faith" and sent a message to whoever may have abducted her: "Please release her, let her go."

Davis said he has been cleared as a suspect in Cornwell's disappearance and passed a polygraph that he volunteered to take. He said he was two-and-a-half hours away when Cornwell was taken.

"They validated that by my telephone records," Davis told FOX. "I have never to my knowledge been considered a suspect." He said he had nothing to do with her disappearance.

The family has set up a Web site to help find Cornwell.

The Associated Press contributed to this report.