I'm so sorry for the confusions and stress about this. There are so many misconceptions about HPV out there, I understand how it can be confusing and stressing.
Here is a quote from The STI Files: Human Papillomavirus (HPV)
(which I recommend that you read for even more information):
There is no cure for HPV but around 90 percent of people clear the infection on their own within two years. Unfortunately, there is no test that can tell you whether or not you’ve cleared the infection. If you’ve ever had genital warts or been told that you have HPV, your safest bet is to assume that you can spread it to other people, especially for the first two years after diagnosis.
So, it's quite unfortunate that you can't find out for sure
that your body cleared HPV, even though we know it's probable
that you cleared it.
That said, finding one bump and leaping to HPV transmission and/or partner being dishonest does not sound necessary to me at this point. Sometimes people just get bumps, pimples or other types of skin things. Are they concerned about this bump? Are they able to speak to a doctor about it? I know that in-person doctor appointments are not easy or even possible in many places right now, but perhaps they could reach out and try for a chat or video appointment?