Unfortunately, if your YouTube history was deleted, you will not be able to recover the history. Make sure that you double check to make sure that you don't delete your video history and when a confirmation message pops up asking if you want to delete your history, make sure that you can live without the watch view history or search history.
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"Ctrl+H", if there's nothing on the history, then your wife has deleted the history on your internet. However, you can specifically remove parts of the History, so this isn't 100% accurate.
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Yes they can.
Well no, but your Internet Service Provider can still pull a log up and see what websites you've been visiting. Even if you deleted your browser history.
I don't think there is really anyway you can get the history back once it's gone.