STD

This guy decided to out a girl he hooked up with after he found out she had herpes, after not disclosing it to him when they originally hooked up. Apparently he posted anonymously on their University's Facebook page, and just wanted to warn other people, because of his experience with her deceiving him. From there he proceeded to face quite a bit of backlash. Was he in fact the asshole for outing her, or did he do the right thing? Or, are they both just kind of crappy people in this equation?