Teresa's "Lovebird" is about the end of a relationship and the gentle, unbitter way the speaker chooses to look back on it. The image at its center is a lovebird living inside her heart. When she falls in love, it wakes up, and she gives the man everything she has. The love feels so large that she could "fly to heaven or beyond," if that is where the two of them wanted to go.
Then the tone shifts. The story has ended sadly, and their dreams stayed unrealized. What stands out is how kind the speaker remains. She doesn't blame him. She simply wishes he will find the love he's looking for, even though she says she'll always love him. For herself, she hopes the lovebird will take flight again and her heart will heal, leaving only the happiest memories. The mood is wistful and tender, sad but quietly hopeful, like someone letting go without slamming a door.