Syphilis, exams an doubt

Goodevening,

in 2011 i noticed a syphiloma on my penis, but unfortunately i didn't recognize it as syphiloma. A few days later i took amoxicillin, given by my doc, for tonsillitis.

In 2012  i did the routine mst exams and i discovered i've had siphylis. Vdrl was - and tpha +; the doctor just said it was a previous event of syphilis, maybe treated by the amoxicillin , so he decided it was not necessary to do any treatment.

i decided to trust the doctor.

i've repeated mst exams every year without any change. Actually Vdrl is neg and TPHA is 1/80 . 

Western Blot treponema IgG+IgM:

IgG banda 47: neg

IgG banda 44: pos ++

IgG banda 257: neg

IgG banda 453: neg

IgG banda17: pos +

IgG banda 15: neg

IgM banda 47: neg

IgM banda 44: neg

IgM banda 257: neg

IgM banda 453: neg

IgM banda 17: neg

IgM banda 15: neg

Which could be the clinical interpretation ?

is this latent syphilis or is the sign of a previous treatment?

in case of a 3rd latent syphilis, which could be the best clinical approach for treatment? and wich is the best treatment in case of involment of heart or other organs?

thanks