There are pictures of Britney leaving Justin’s house in April of 2003, they were definitely messing around at that time (pictures here —>
Then, the Kids choice awards happened (Britney & Justin attended) and that’s where he met Cameron Diaz.
I think Britney and Justin broke up for good after that.
Also, I can see Britney ignoring him when she was pissed off. Don’t ever forget how brutal was the break up with Kevin.
She texted him that she was divoring, she fled to New York, and the public announcement was made. When Britney is done with your ***, she doesn’t seem to go back.