In the versions I've seen the third line in the first verse reads "Must I enact such a childish part" or "Must I then act the (a) childish part".
June Tabor on her A Quiet Eye Album titles it "Must I Be Bound" and sings other verses.
^^
MUST I BE BOUND

Must I be bound while you go free
Must I love one who never loved me
Must I enact such a childish part
And follow one who will break my heart?

The first thing that my love gave me
It was a cap well lined with lead
And the longer that I wore that cap
It grew the heavier on my head.

You gave me a mantle for to wear
Lined with grief and stitched with care
And the drink you gave me was bitter gall
And the blows you gave me were worse than all.

And the last thing that my love gave me
It was a belt with colours three
And the first was pain and the next was sorrow
And the last was sda misery.

But I will climb up that high tree
And I will rob that wild bird's nest
And I will fall without a fear
And find me one that loves me best.

Must I be bound while you go free
Must I love a one who never loved me
Must I enact such a childish part
And follow one who will break my heart?

Obviously not 18th century sentiments. I seem to recall a thread seeking songs about the abuse of women and think this belongs there. - Charles