Okay, to be sure I understand the dates:
April 2020 - negative hsv2 test, positive hsv1 test
Jan 2021 - relationship ends, restarted old relationship - still hsv2 neg
March 2021 - single encounter with 3rd person, small spot on skin - goes away
29 days later - hsv2 IgG is 7.75
I think I'm confused - is March guy one of the other 2 guys or a 3rd guy? You mention "both guys say they are negative" - is this because you haven't talked to March guy?
It's fully possible to be at a 7.75 at 29 days. Hsv1 can delay things, but doesn't always. Have you actually seen the other guys' results? Have they actually tested, and tested negative?
With the 29 days - are you counting from the encounter, or from the onset of the symptoms? Count from the encounter.
Let me know if I'm understanding this, or if I'm way off base here.