My goodness you have received some varied opinions about the meaning of your test results.
IF you have a true positive on the IgG antibody test, it means you are definitely infected and infectious to others. There is no such thing as having a positive antibody test and just being exposed but not infected. Period.
However, your index value is at the low end of the positive spectrum and in that spectrum we see a fair amount of false positives. So if it has been 4 months since your last sexual contact, I would strongly encourage a western blot, yes. You can do this by obtaining a kit from the University of Washington, having your doctor draw and spin your blood and return the kit to UW OR you can set up an appointment with our clinic to become a patient of ours and we will arrange a blood draw for you at a lab near you and they will send the blood to UW.
Many straight people have outbreaks near the anus or on the buttocks. The virus establishes latency and can come out on any branch of that nerve. That nerve supplies the area between the waist and midthigh and outbreaks in any of those area with HSV 2 are genital herpes outbreaks. Since the virus is already all in that nerve group, you cannot spread it any more to those areas.
Please let me know if you have other questions.