Perfidy or treachery are obviously nouns and the safest way to use them is put them in a possessive conjunction. For example: 'John's treachery' or 'the perfidy of Ronnie's actions'. Treachery and perfidy do not connect with verbs easily which is why they sound awfully awkward with verbs. Let me give you some examples:
'It's a shame that you haven't noticed his treachery earlier. We might have been able to mitigate the damage.
'Oh you can't possibly be serious?! I'm done putting up with you perfidy, good bye!'