Recently I Did My Herpes Type-specific Blood Tests, Results Came

Recently i did my herpes type-specific blood tests, results came a couple of days ago and HSV-1 was positive but HSV-2 was negative. I did have a sexual encounter about 3 weeks before the test. I have never been tested before and I have never had any of the classic symptoms so I don't know if the positive results are from this recent encounter or if I've been positive for a long time and didn't know.

The report says HSV1 IgG level was around 3.66 (note that >1.1 is positive). Do the numbers go up over time or down or is there anything that can be determined by that number other than infected or not infected? How great are the risks of me giving HSV1 to someone who has tested negative about the same time I tested positive?