My Girlfriend Has Sore On Her Vagina And Says She

My girlfriend has sore on her vagina And says she thinks I gave her herpes I tested negative 2 months ago and she's having an obvious outbreak of Something but is it possible that I just haven't contracted it if she got it in the last 6 months and we have sex 1nce of twice a week ? Thanks don't want to catch it but I think she cheated more recent but didn't say the truth... Confused but we're taking a break sexually to both get tested me not till end of month but i think she's lying to me