Coach Psychologically Damaged My Son- Diddy

Sources close to Diddy have opened up on the fight that led to the mogul's arrest. They claim the coach, Sal Alosi has been cruel to Justin (Diddy's son) for close to three years. He has practically bully the young man.

  According to TMZ:
  The sources say it was evident to anyone who watched ... Alosi was bullying Justin, psychologically
damaged him.

We're told Diddy was well aware of the "bullying" and when Justin came home Monday, he said he was told to leave the field and not return for the summer. Diddy decided it was time to have a talk with the coach -- and we know how that ended.

We've reached out to UCLA Athletic Dept. for comment ... so far, no word back.