Analysis of Yes, thou art changed since first we met

YES, thou art changed since first we met,
But think not I shall e'er regret,
Though never can my heart forget,
The charms that once were thine:
For, Marian, well the cause I know
That stole the lustre from thine eye;
That proved thy beauty's secret foe,
And bade thy bloom and spirits fly:
What laid thy health, my Marian, low,
Was anxious care of mine.

O'er my sick couch I saw thee bend
The duteous wife, the tender friend,
And each capricious wish attend
With soft, incessant care.
Then trust me, love, that pallid face
Can boast a sweeter charm for me,
A truer, tenderer, dearer grace
Than blooming health bestowed on thee;....
For there thy well-tried love I see,
And read my blessings there.