Igg antibody is just to show if there is a presence of herpes virus?

Exposure: As written multiple times before, igg shows exposure to the virus at some point in the past. In all likelihood, due to the chronic nature of the virus, you do have it in your body; whether or not it is manifesting is a different story, and depends on symptoms.

Yes: Igg shows if you have ever had, and once igg is positive it will remain so for life. Igm shows up in first week or two after initial infection, & only shows that recent infection has occurred, & then igm diminishes. If igg is positive the virus might be dormant, or it might be activating, there is no way to know except if sores develop. Sores would indicate that the virus is activating again.