Hey Verecocha, first of all, I'm not supposed to be here anymore, said I'd quit, but your story made me have to reply. I am/was in a very similar situation to you, as you can guess from my name, I'm not a JW.
I'd love to say 'run for your life' 'you're better off out of it' etc, but I know where you are coming from and it ain't that easy! I'd love to say, 'hang in there' it'll get better, but I KNOW it doesn't.
While I don't condone having a relationship with a married person, we don't know all the facts. So, it's not mine to judge.
It makes no sense. And it hurts like Hell. The too-ing and fro-ing comes from the deep seated illogical guilt, fear and goodness knows what else! When the JW mask slips and you see the person underneath you feel you are gaining ground, then BOOM, the mask goes back on. We, are bad associations, we, in the eyes of JWs, will never be good enough. As much as they love and care for us, FEAR + GUILT = control. We will only get our hearts broken, time and again. They WILL be 'encouraged' to stop 'associating' with us. it doesn't matter what we do.
As far as I can work out, unless they Wake Up, there is not a cat in Hells chance of this ending well.
I'm sorry I can't be more help, I'm sorry I don't have any answers, I need them myself. If you ever find any, let me know!! Good luck my friend!