But then, the poem will be 124 words (by changing "thirty two" to "eighteen"), so we will have to change 125 to 124. Then, he will be able to say "I love you" a

But then, the poem will be 124 words (by changing "thirty two" to "eighteen"), so we will have to change 125 to 124. Then, he will be able to say "I love you" an exactly 18 times. So now we are 3 words shorter (by removing "and a third"). So it comes 121. With 121 words, he will be able to say "I love you" exactly 17 times. So, there you go. Change "one sixty seven" to "one twenty one", and "thirty two and a third times" to "seventeen times".