The speaker starts with a complaint that love has treated them badly, then turns it around: if love has been unfair, so have they. The unfairness they confess is a particular kind. They went looking for love in "foreign hearts," in other people's company, and left their own heart "desolate," empty and neglected.
The last line explains the mistake. The speaker acted as though their heart couldn't function without someone else's touch, as though it were helpless alone. The subtitle, "Two to Tango," seems to play against this. The saying means a relationship takes two people, yet the speaker seems to wonder whether they ignored their own part by relying so heavily on others.
The mood is quiet, regretful, and a little self-critical. There's no anger here, just a calm, honest admission. The speaker doesn't blame love entirely, and the poem ends with a hint that the heart might be stronger than they once believed.