On “Lonely,” Akon wishes he had treated his girlfriend better after she leaves him.

https://genius.com/Akon-lonely-lyrics

This song is about a boyfriend who neglects his girl and takes her for granted. One day, he wakes up and she’s gone. It’s only in her absence that he realizes what she means to him and comes to appreciate her. >>

https://www.songfacts.com/facts/akon/lonely

“Lonely” was a commercial success, reaching the top five on the charts in several countries, including the United States, the United Kingdom, and Australia. The song tells the story of a man who is struggling with his emotions and feeling alone. The lyrics describe his longing for human connection and his fear of never finding it. The chorus, which is repeated several times throughout the song, is particularly poignant:

1. “I’m so lonely, I’m Mr. Lonely
2. I have nobody for my own
3. I’m so lonely, I’m Mr. Lonely
4. I have nobody for my own”

https://oldtimemusic.com/the-meaning-behind-the-song-lonely-by-akon/