Priscilla's poem is about all the things a person never said to someone who hurt them. The speaker opens by admitting there is a lot she could have told this person, every time they made her sad, made her cry, or made her angry. But she never spoke up. She "choked them back" and made an excuse, which suggests she was protecting the relationship, or maybe just avoiding a fight.
The short lines in the middle, "Cry." and "Or mad.", land like small, painful interruptions, as if the feelings keep breaking through the calm surface of the poem. Then the speaker asks a question and answers it herself: those unspoken words didn't disappear. They turned into the tears she cried every night.
The mood is quiet, sad, and a little lonely. There's no shouting here, only private hurt. The poem's point is simple and believable: feelings you hold in don't vanish, they just find another way out.