Long-running talks over a proposal for Tenet Healthcare Corp. to acquire five Connecticut hospitals have failed to produce a deal, the company and governor's office announced Wednesday. The Dallas-based company said it is best for the hospitals and their communities to move forward exploring other options. The on-again, off-again negotiations stretched on for more than two years as Tenet considered acquiring hospitals in Bristol, Manchester, Vernon and Waterbury. Gov. Dannel P. Malloy said the issues separating the two sides "simply could not be overcome." But he said his administration still planned to work with the hospitals, affected communities and the General Assembly "to come up with smart, creative solutions that will preserve local access to care for all patients."