what is the theme of "evelyn hope" and how this poem is a dramatic monologue?

In this poem by Robert Browning purity of emotions is discussed at length.This poem is a dramatic lyric.Evelyn Hope is the name of a girl who is dead now and the lover is sobbing at her death and expressing his feelings of love for 'Beautiful Evelyn Hope'. The poem is a dramatic monologue because it recalls an unfolding of events from a first-person perspective.