Piteous my rhyme is
What while I muse of love and pain,
Of love misspent, of love in vain,
Of love that is not loved again:
And is this all then?
As long as time is,
Love loveth. Time is but a span,
The dalliance space of dying man:
A  rhetorical question  that implies that love doesn’t give much. The short line suggests its limitations, as if there is nothing more to say.
Piteous my rhyme is