classic waka stream

忘るるかいささは我も忘れなん
人にしたがふ心とならば
Roma-ji

Wasururu ka isa sa wa ware mo wasurenan hito ni shitagau kokoro to naraba

English Translation
So you would forget?
Then come, I too will forget,
as you have done,
if only it were a heart
that followed where yours leads.
Meaning
So you are forgetting me? Then come, I will forget you too—if only my heart were the kind that follows yours.
Commentary
Book Fifteen Love Poems V 993

Headnote: "Topic unknown"
The poem says: you are forgetting me? Then come, I too shall forget, if only this heart would follow yours. Putting on a brave face against the other's change of heart, it hints, through a supposition, that in truth one's own heart will not do as one wishes.

First line, "wasururu ka," means "are you forgetting?" pressing the other about their change of heart. The poem breaks here. Taking up "wasurehatene to" in the final line of the preceding poem, 992, it repeats the word "wasuru."
Second line, "isa sa wa ware mo," means "come then, I too," with "isa" an inviting word and "sa wa" meaning "if so."
Third line, "wasurenan," means "I shall forget," with "na" the irrealis of the perfective "nu" and "n" volitional. The poem breaks here again.
Fourth line, "hito ni shitagau," means "following the other's heart."
Final line, "kokoro to naraba," means "if it were such a heart," an inversion that adds a condition to the resolve in the third line. It leaves the implication that the heart does not follow the other.
Author
Unknown Poet
Source
Shui Wakashu
Prev Poem
Au koto wa kokoro ni mo arade hodo fu tomo sa ya wa chigirishi wasurehatene to
Next Poem
Wasurenuru kimi wa nakanaka tsurakarade ima made ikeru mi o zo uramuru