When he writes:

That you were beautiful, and that I strove
To love you in the old high way of love;

Yeats is pronouncing "love" in two different ways. The second is, of course , the way it was pronounced in the "old high days."

i too am enamoured of this "love" rhyme, and the same strain or failure to make a perfect "match" that you hear, eofiss, in this pair calls attention to what i think is an amazing set of off- or slant-rhymes in "Adam's Curse", which includes, at least:

poetry with maybe

clergymen with thereupon

school with beautiful

enough with love

strove with love

and

grown with moon

there's a book to write on the ramifications of all the things that Yeats accomplishes with these near-rhymes--not the least of which is a characterization of what it means to love after Eden, under the sign of Adam's Curse. i find a wonderful humor in this characterization, begun by linking "poetry" and "maybe," and ironized by the end because poetry turns out to be possible after all.