The 36-year-old former Cherries striker led the club to the play-off semi-finals last season and despite a disappointing current campaign which sees them lying 13th, he was confident they could push for promotion again next term.
Bradbury has also confirmed he was axed by chairman Eddie Mitchell, rather than leaving by mutual consent.
"I am naturally very disappointed that I have not been give time to see the fruition of all the hard work that has gone in to developing the current squad of players," he told the League Managers Association.
"I felt that we would be in a position to make a positive challenge for promotion next season, but it was not to be.
"I am never one to duck a challenge, so I would like to take this opportunity to clarify the fact that I did not resign or leave by mutual consent, the chairman decided that he wanted a change and I was dismissed."
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