How does hamlet re-act to Ophelias Death

Hamlet gets pretty shaken up. Hamlet and Horatio are hiding behind some bushes watching the funeral procession. When Laertes laments his sister's death, Hamlet finally clues in that the funeral is Ophelia's.

I loved Ophelia. Forty thousand brothers Could not with all their quantity of love Make up my sum. What wilt thou do for her?

So, yes Hamlet is upset but it is rather ironic because of how he had used Ophelia to achieve his own ends for revenge.