>>>Like in Japanese culture, make sure that everyone saves face. <<<
Okay I missed page two of these posts. Eliza, ignore the [now deleted] drivel above. Carrie has it right. Talk to the other ladies that have BT, DT.
From a guy's perspective, I would be hurt if a woman (paid or not) said she must move on and not see me anymore (I mean I'm such a catch!). But if the proximity had you running for cover in a bathroom, you have to end the relationship. Okay the saving face part above still makes sense.
At the end of the day, there might come a social situation where you both are in attendance and there won't be much you can do outside of excusing yourself.
I have never met anyone from this part of my life on the other side. it would be an eye opener to say the least. Personally I would keep it down low, and not say anything unless an opportunity to speak in private presented itself.