repine
verb (used without object)
to be fretfully discontented; fret; complain.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
While you are repining over what is beyond recall, events are moving on.
From Problems of Expansion As Considered In Papers and Addresses by Whitelaw Reid