Since you had testing only 10 days after the contact with partner #3, I think it was a bit early for the test to be accurate. Condoms reduce transmission from females to males by 65% so certainly helpful but not perfect. I would recommend that you retest at 6 weeks out and see what your status is.
The inhibition assay is not on a par with the western blot, for the record.
I think it is very likely that the test you had done in December was a real negative, but again, the timing wasn’t the best.
Terri