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Comedian Steve Harvey, 54, has become a love and relationship guru through a slew of bestselling self-help books.

In real life, however, his ex-wife claims he was a disastrous husband. In a trio of YouTube videos that have gone viral, Mary Harvey goes off on the comic -- accusing him of cheating on her constantly and ending their marriage ruthlessly.

"He turned my son against me, had me evicted from my house," Mary says in one clip. (They divorced in 2005.) "I woke up, and everything was gone."

She also alleges that he was unfaithful throughout their 16-year relationship -- adding that his current wife, Marjorie Bridges, was originally his mistress.

Steve Harvey's attorney fired back, saying in a statement: "We are appalled and aware of the videos and other fabricated documents ... which contained false, misleading, derogatory, disparaging, malicious, explicit and slanderous information about Mr. Harvey, his current wife and others."

"We are saddened that the ex-wife has resorted to such devious and selfish behavior, with a reckless disregard for their minor son, her adult son and Mr. Harvey's other children."