I've made friends with girls who quit working as WL/ML and those who are still in the industry, for those who still work as WL/ML I put boundaries in place where I don't involve money with each other, don't see them at their work & no sex. They tell me stories on how their work is at the shop and I share my shop adventure stories.
For girls who quit the industry then we don't discuss to our mutual friends how we met, some of the girls find a guy for a Visa or have a genuine relationship they don't want an ex customer causing drama for them.