Vaginal inflammation (colpitis) due to a Trichomonas vaginalis is a common sexually transmitted disease (STD). Males usually don’t get the infection because the urethra is more resistant to the infective agent. In rare cases, Trichomonas can affect the urethra, prostate or epididymis in males. Males are usually non-symptomatic transmitters of the infection. Females can get the infection in rare cases of very bad hygiene of the genitals, as well as via unprotected sex. In your case, it doesn’t seem likely that your partner had the infection for 8 years. Even if he was a non-symptomatic transmitter, you would have gotten the infection much earlier.