In just a few lines, the speaker admits that everything they know about romance came from movies. The first line sounds almost casual, but the next one, "No wonder," turns it into a rueful confession. The speaker sees a link between that borrowed education and the way things have fallen apart.
The word "shattered" is the sharpest in the poem. It suggests something fragile, like glass or a plate, and that fits the title, "Dish Night," which seems to point to the old movie-house habit of giving away dishes, though that is an inference from the title alone. The odd capital in "Lies" stands out. It may mean the lies of the movies themselves, the false promises of love on screen, or the speaker's own lies. The poem leaves that open.
The mood is wry, regretful, and quietly bruised. The speaker doesn't shout about the hurt. They just state it plainly and let the broken image do the work.