The speaker is angry at Death because it has separated him from his friend.
This poem, In Memoriam A.A.H., was written by Alfred Tennyson in the 19th century to remember and honor his friend Arthur Henry Hallan, who died of a cerebral haemorrhage at the age of 22. The poem consists of 131 sections, a prologue and an epilogue. In this excerpt, what allows the reader to realize that the speaker is angry at Death because it has separated him from his friend are the verses "He put our lives so far apart We cannot hear each other speak".