Is this poem happy or sad? Tell me why.

When I am dead and over me bright April
Shakes out her rain-drenched hair,
Tho’ you should lean above me broken-hearted,
I shall not care.

I shall have peace, as leafy trees are peaceful
When rain bends down the bough,
And I shall be more silent and cold-hearted
Than you are now.
This is a sad poem. She imagines she will escape her pain and find peace in death. She appears to be writing to a forlorn lover who is cold-hearted and not speaking to her anymore. It's sad she thinks death will bring relief. It's sad she's being given the cold shoulder by someone she cares so deeply about.