How will you know which person spread the herpes virus to you?

Ask if they have or: Cold sores (also called fever blisters.) groups of fluid-filled blisters that often erupt around the lips and sometimes under the nose or around the chin. Cold sores are caused by the herpes simplex virus type 1 and are very contagious. The initial infection (primary herpes) may be confused with a cold or flu and can cause painful lesions to erupt throughout the mouth. Once a person is infected wi.

ONLY IF SINGLE PARTN: You will know who gave it to you if you have a single partner only.But if you had sex with multiple partners and none discloses that he/she has the hepes infection you will never know unless you get all of them tested.