I have been with my husband for 21 years. we separated for three months in 04. in 2014 i was diagnosed with tric. he admitted to cheating one time in 04. i have had wet mounts every year and always test negative until 2014. could he have had it since then

Years, easily missed: Trichomonas can be carried for years without symptoms, especially in women and maybe sometimes in men. The wet mount misses half of all trich infections. There is no way to know when you were infected or whether it has anything to do with your husband's partner(s) in 2004. With your apparent concern he might have had other partners since then, to be safe you both should be tested for other STDs.

Tric: Since it is an infectiious disease If he was not treated he could have been infectious since then Get treated and have him treated as well now discuss with your doctor.,