Gwyneth is in shock over Yvonne

Gwyneth is left reeling by Yvonne's admission. Is there any trust between them to make a go of their relationship?

Meanwhile, Anita's advice to Moc backfires as he realises that he can't live without Sheryl.

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Ni all Gwyneth gredu mai Yvonne sydd wrth wraidd y llythyron. Heb ymddiriedaeth, a oes unrhyw obaith i'w perthynas lwyddo?

Mae cyngor Anita yn cael effaith go chwith ar Moc wrth iddo sylweddoli na all fod heb Sheryl.