How do you use treachery in a sentence?

He takes any disagreement as a sign of treachery, no matter how diplomatically it is presented.

It wasn't until after we fired him that we discovered the full extent of his treachery, for not only had he been embezzling from the company, but he had been selling trade secrets to our competitors.

I can't believe she thought I wouldn't find out about her treachery, when she sent those emails from her own account.

He found himself disgusted by his own treachery, and decided to do his best to make amends.

She was so paranoid about losing him that it became a self-fulfilling prophecy, for he grew sick of her constant accusations of treachery and dumped her.