If you are in a literature EIN
course on Shakespeare, there are abundant, almost boundless sites for ethical reflection. See, for example:
Rethinking Shakespeare’s Political Philosophy: From Lear to Leviathan
Shakespeare’s Philosophy – Colin McGinn’s book is good, but is perhaps better understood as using Shakespeare to illustrate some independently interesting ideas rather that offering an exposition of Shakespeare’s actual philosophy.
For an offbeat treatment of Shakespeare in light of the popular Romantic Comedy Love Actually (2003), see “Shakespeare Actually” in the book Love, Love, Love: And Other Essays by Charles Taliaferro.