What is an analysis of Thomas Wyatt's poem "And Wilt Thou Leave Me Thus," and who is it dedicated to?

Thomas Wyatt's poem "And Wilt Thou Leave Me Thus" isn't written in the sonnet form of fourteen lines with an ending couplet. Instead, it has four sextain stanzas (six lines each), each beginning with "And wilt thou leave me thus?" and ending with a repitition of "And wilt thou leave me thus?" followed by the pleading "Say nay, say nay!" Stanza two has the variation "As for to leave me thus?" The rhyme scheme is abbba, followed by "Say nay! Say nay!"

Wyatt wrote this impassioned poem as a plea to his mistress not to leave him after all the years they had been together. In it, he pleads with her to say "no" out of the shame of causing him grief and sorrow after all the years that he loved in "wealth and woe" and never faltered through "pain nor smart."