Barry, I take it back-- it likely is MG, in cold fact. I wish I had written that I don't think she is necessarily involved: the poem is about someone fiercely, deeply loved, and the feeling that such love is exhausted. And if I think about the little I know of the relationship, I feel like "it had all seemed happy" is a brilliant fiction: excellent for this poem, but maybe not accurate about the actual two people? Mainly: I am, in my enthusiasm for the invention and inventiveness of the poem . . . wrong.