In three short lines, the speaker looks back on being left alone by someone, addressed as "you." The poem is titled "Maria," so it's natural to guess she is the one who left, though the text never says so outright.
What stands out is how the speaker describes their reaction. They say they never thought of regret, which suggests either pride or a refusal to look back. But the second line admits that pain was all they felt. The two statements sit side by side without much explanation, and that gap makes the feeling seem real: the speaker may not have let themselves regret anything, yet the hurt was still there.
The last line adds a small, surprising turn. Happiness was present, but hiding behind the pain. It's not gone, just out of sight. The mood is quiet, sad and a little hopeful, as if the speaker is saying that even in loneliness, some good feeling was waiting to be found.