Abbie's poem is about a relationship where two people copy each other's behavior, until one of them finally stops matching. In the first stanza, everything is an echo: she ignores him, he ignores her back; she goes quiet, he goes quiet; she smiles, he smiles. It looks like a balanced exchange, but it's really a standoff in which each person only reacts.
The second stanza breaks the pattern. She texts, he texts back. She calls, he calls back. Then the last line shifts: "She loved him, and that he didn't reply." The grammar stumbles here, and that seems to be the point. Love is the one thing he doesn't mirror.
The speaker sounds quietly hurt and resigned. There's no angry outburst, just flat, repetitive lines that make the ending land harder. The mood is bittersweet and a little lonely, the feeling of giving everything and getting only polite echoes.