The poem is a single line, and it works like a confession the speaker can't quite hold back. Every love song, they say, is still about "you," meaning Maria, the person named in the title. The word "still" matters most here. It suggests the relationship is over, or at least out of reach, yet the speaker hasn't moved on. Songs that were once just songs now seem to point back to her.
The time, 3am, adds a lot. That's the hour when distractions fall away and thoughts get louder. Judging by the setting, the speaker is awake and alone, maybe listening to music, maybe just remembering. The mood is quiet, tired, and a little raw. There's no anger or drama, just a plain admission that the feeling hasn't faded. The lowercase, unpunctuated style makes it sound like a thought typed late at night and left as it is.