It is untrue that only 1/3 of HPV infections are sexually acquired. HPV is a sexually transmitted infection; exceptions probably occur, but they are rare.
If neither you nor your husband has had other
sexBuccal smear
Causes of sexual dysfunction
Child abuse - sexual
Delayed ejaculation
Erection problems
Female sexual dysfunction
Inhibited sexual desire
Orgasmic dysfunction
Puberty and adolescence
Rape
Safe sex partners, then you probably have had HPV for over a decade, and it is likely that the same infection caused your dysplasia both 5 years ago and now. LEEP and other treatments don't necessarily get rid of HPV itself.
It is almost never possible to know with certainty when HPV was acquired or from which sex partner (unless, of course, someone has only had one lifetime partner). Getting HPV is normal; it happens to at least 80% of us, usually within our first 3-4 lifetime sex partners. At this juncture, just deal with the dysplasia, i.e. follow your doctor's recommendations for treatment and follow-up. But don't lose sleep over where the infection came from; it's a no-win situation with no clear answers.
And by the way, nothing need be done about your husband if there is nothing visibly wrong, and you don't need to avoid sex with him or use condoms.
Good luck. And really, don't let this worry you!
HHH, MD