Been in a monogamous relationship for 15 years. hpv vaccinated. tested positive for hpv last week how does dormant hpv work? should i be worried? husband had when we first met and had warts from time to time. any information would help relationship?

Nobody is at fault. Everybody gets HPV, most often during youthful dating, when most people are most sexually active. There is no special way dormant HPV "works"; reactivation is random, and newly diagnosed HPV often appears many years into monogamous relationships -- usually detected by Pap smear, sometimes with recurrent warts. Doesn't imply new partner. This should be no big deal for you.