The same thing happened to me and my husband

Both on our rears above our cracks ...same place. It was very strange. I had never even had a mouth herpe before. We had our outbreaks 3 days apart the first time and had only been on it a few days. I used mms for I think 6 mo's and had these outbreaks off on then I stopped because mms made me so miserable with no help whatsoever. I rifed myself and have not had this outbreak since.
Sorry I know it sucks
It makes you wonder for a minute who the hell was cheating on who.
try to get a rife treatment

Alex