For being on a show called Mistresses, Dom is really not great at this whole “affair” thing.

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In TVLine’s exclusive preview of Monday’s episode (ABC, 10/9c), Dom attempts to keep Toni quiet after their one-night stand by uttering those magic words all mistresses dream of hearing: “I need this all to stay between us.”

But judging by the look on Toni’s face — and the fact that the episode’s logline says her “hidden agenda becomes clear” — I’m thinking it’s safe to say Dom’s secret will be out by the end of the hour.

Hit PLAY on the preview clip above, then drop a comment below: Do you think this is the end for Dom and Savi? (And should it be?)