Messi had become disillusioned with life at the Camp Nou over the past year, with him unhappy with performances on the pitch and how the club was being run at boardroom level.
The 2019/20 season presented the first in 12 years in which Barcelona failed to win any major silverware.
Things came to a head after they were embarrassingly dumped out of the Champions League after a 8-2 loss to Bayern.
Not long after, Messi requested his contract be terminated, allowing him to speak to other clubs.
Barca refused and insisted that his release clause would have to be paid for him to leave.
Despite airing numerous grievances in an interview with Goal.com, including major criticism aimed at president Josep Maria Bartomeu, he announced his intention to stay, not wanting to enter into a legal battle with the club he has been with since the age of 13.
It seems, now, though, he just wants to put the situation behind him.
"I take responsibility for my errors and if they existed, it was only to make FC Barcelona better and stronger," he told Sport.
"I wanted to send a message to all the socios and fans that follow us. If at any moment, any of them were annoyed by something that I said or did, let there be no doubts that anything I did was always with the club's best interests in mind.
"After so many disagreements, I would like to bring an end to everything. We all have to be united and assume that the best is yet to come," the 33-year-old said.
"Uniting passion with excitement and motivation will be the only way to achieve our objectives, always united and rowing in the same direction."
Ronald Koeman is the new head coach of Barca after the dismissal of Quique Setien, and his new-look side started the season off in excellent fashion with a 4-0 home victory against Villarreal, with Messi getting on the scoresheet.
The Dutch boss remains determined to bring in squad reinforcements, though, with Memphis Depay and Gini Wijnaldum on his radar.