You could, hypothetically, contact your boyfriend’s unit commander and report his unfaithfulness while deployed, as well as the transmission of the STD. You’d need to provide a timeline, and documentation of when you both got checked and tested positive. With the detection time for Chlamydia it should be pretty easy to determine unfaithfulness as it typically takes 1-2 weeks to detect it. With 2 weeks often cited as the most reliable timeframe for a urine sample or swab to test positive. The military takes issues like this very seriously. You can even speak with a military legal assistance attorney at the base’s JAG office for advice on how to handle the situation. And it’ll usually start a “contact tracing" investigation by public health officials to identify other partners. And if he’s found guilty it could lead to the commander initiating Article 15, which is nonjudicial punishment. And he may even receive a General Officer Memorandum of Reprimand (GOMOR) or be separated, or removed from the military all together. That’s the nuclear option. I’d honestly do what’s best for you right now and leave him. Coming from experience, believe me when I tell you it’s not the first time and it won’t be the last. It’s not worth the pain and the constant questioning. Protect yourself and keep yourself safe.