As the poem opens, the speaker describes how he was angry with his friend. Bad times.
Still, he told his friend he was angry ("I told my wrath"), and presumably why he was angry, and his anger disappeared. Happy days are here again!
We notice that these lines are linked with end rhyme and a pretty consistent rhythm. We wonder if this form will continue. (Spoiler alert: Check out "Form and Meter" for more on this.)