If a victim doesn't want to press charges on someone who was arrested in tx on a 3rd felony count ,is the person still going to jail?

Yes. When the cops come out the ball is pretty much rolling. They make a report and then they call the district attorneys office. They ask the DA's if they'll accept charges. The DA's tell them what charges they'll accept, and then the accused person is arrested and taken to jail. At that point the only person who can dismiss it is the district attorney. There are ways the victim can help. But, the best thing to do is to work with his attorney to try and get the case resolved.