Dante's poem is about two ex-partners who have each moved on, and about the speaker coming to terms with that. The opening lines sound calm and almost rehearsed: "I am happy / You are happy / We are happy." But the next line admits that the love hasn't vanished. It is "loud enough like a scream," which suggests feelings that are hard to ignore even after the relationship is over.
The middle of the poem is a quiet argument. The ex says the speaker cries "as if it's the end of the world," and the speaker answers that the tears came from being with that person, not from the breakup. Since then, there have been no tears at all. When the ex talks about someone new, the speaker feels a pang in the chest, but not out of jealousy. It comes from wishing the ex well. The mood is bittersweet but steady, and it ends on a note of self-discovery: the speaker finds happiness in themselves and in the people around them.