If you did have HSV, the result will NEVER go from a positive to a negative.
If you tested positive with a low result, it is MOST LIKELY A false positive. And 152 days is quiet enough time for your body to build antibodies and show up in the IGg blood test.
The intake from this is,
You spent enough time for your body to build antibodies and show up in the test, and nothing showed up.
You can never go from a positive to a negative if you really had HSV.
CDC does not recommend testing for HSV2 only in case of presence of lesions because the statistics of how common False Positives for this test is insane.
You have nothing to worry about, I have been there. Please be safe and carry on with your life.