Question

Can someone help me analyze that last stanza

When I was one-and-twenty
I heard a wise man say,
'Give crowns and pounds and guineas
But not your heart away;
Give pearls away and rubies
But keep your fancy free.'
But I was one-and-twenty,
No use to talk to me.

When I was one-and-twenty
I heard him say again,
'The heart out of the bosom
Was never given in vain;
'Tis paid with sighs a plenty
And sold for endless rue.'
And I am two-and-twenty,
And oh, 'tis true, 'tis true.

Answer 1

ABCB,ABCB,ABCB,ABAB.