As we previously reported, Bosh's ex Allison Mathis claims she had brokered a $250,000 deal with "BW" producers to appear on the show -- but Bosh threatened to sue if that happened, so the producers caved ... and axed Allison after she had already taped two episodes.

But Bosh claims it's all BS -- firing back with his own legal docs in Orange County, Florida ... insisting it's not his fault producers decided to cut Allison from the show.

According to Bosh, whatever he may or may not have said to producers ... his intention was never to ruin Allison's career -- he was merely "acting to protect his own economic or financial interests."

As a result, Bosh insists he shouldn't have to pay Allison squat for the entire ordeal -- and wants a judge to trash her lawsuit.