The song "Used to Be" by Jonas Brothers tells the story of a relationship that has fallen apart. The lyrics describe a sense of longing and nostalgia for what the relationship used to be.

In the chorus, the singer acknowledges that their significant other has moved on and is now spending time with new friends. They reminisce about how their partner used to be the one they loved, emphasizing the loss they feel. The phrase "used to be the one I love" is repeated throughout the song, underscoring the contrast between the past and present.

In the first verse, one of the brothers expresses that he no longer recognizes his partner, indicating that they have changed for the worse. He wants the other person to be happy but feels like they don't believe him or trust his intentions.

The pre-chorus suggests that the relationship deteriorated due to hesitation and doubt. It implies that the decision to part ways was made in the belief that there could be something better out there. The singer encourages their former partner to strive for improvement and find their happiness.

In the second verse, the singer expresses exhaustion from chasing after their partner's "demons." They remark on waking up late and feeling worn out. Although they state that it may be too late, they still express the willingness to come around and be there for their former partner if asked.

Overall, "Used to Be" conveys a bittersweet feeling of reminiscing about a past love and coming to terms with the fact that the relationship has changed. It explores themes of moving on, personal growth, and the realization that sometimes things are not meant to be.