In "A Poison Tree," to whom did the persona show his true anger, and why do you think this happened?

In "A Poison Tree," the persona expresses his anger to his friend. He probably feels comfortable talking to his friend about what upsets him because they have a relationship built on mutual trust. The persona most likely assumes that if he told his friend about why he was angry, the friend would not use this information against him. The persona feels safe, in other words, to express his vulnerability. The persona also probably assumes that the friend does not upset him on purpose or out of malice. Most likely, the persona thinks the issue was a misunderstanding that could be resolved through talking it out. Blake shows that he was psychologically astute in understanding how trust works. As we see later in the poem, when the persona reacts quite differently to an enemy, communication is key to resolving differences.