Don't know why this didn't post the first time - ?? Anyway:

It's sung by Ophelia in Hamlet, Act IV Scene 5. Tune is traditional, also known as "Who List To Lead A Soldier's Life" which is mentioned by Peele in his 1593 play Edward III.

I don't have any more words, but a few of mine are a bit different:

Up he rose and down'd his clothes

Let in a maid that out a maid never departed more

By Gis and by Saint Charity
Alack and fie for shame
Young men will do it if they come to it
By cock, they are to blame

[Last phrase] And thou hadst not come to my bed