Has your most recent partner been tested?
It is possible that you are newly infected – just because you’ve been having sex with this person for four months, doesn’t mean that he was necessarily shedding virus at any point during that time period until recently.
It is also possible that the previous “tears” were also herpes and you just didn’t know it.
A false positive swab test from an area of skin that is open are very very rarely wrong.
Terri