Lifechangers: Therapist on Letterman's Infidelity
Lifechanger and marriage therapist Jill Vermeire talks to "Extra" about why David Letterman cheated -- and how he can repair his relationship with his wife.

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Lifechanger and marriage therapist Jill Vermeire talks to "Extra" about why David Letterman cheated -- and how he can repair his relationship with his wife.