If you like her at all, and it sounds like you do, then don't be an inconsiderate asshole.

Even if it is a professional relationship, you are fond of her, and she is probably fond of you as well. If you simply block her and disappear without explanation, she'll wonder what happened, and if something is wrong, and she'll feel hurt. You owe her the courtesy of a polite goodbye and end to the professional relationship.

jeez, even I could answer this one.

@2.
Absolutely right-on man.

Really, even I know how to get a separate phone line for just her texts. Sheesh.

Duh.

Call me "old-fashioned," but I still cling to the notion that any two people about to begin an intimate phase of their relationship ethically need to discuss sexual histories in a general but non-misleading manner (approximate number of partners and their genders, professional sex workers legal and extra-legal, unsafe sex acts engaged in, etc.) so there's informed consent regarding concurrent STI testing and waiting periods before the new partners engage in unprotected sex.

And I get the distinct impression that BOMP, completely separate from how he disengages from his former sex worker, would lean in the direction of not being open and forthcoming with his new ladylove. I suppose that's his prerogative as long as his coverup doesn't potentially endanger his new partner in any way (as determined objectively, not by wishful thinking), but these days it seems to me that desiring to maintain secrecy about one's own past because you don't think your new partner would approve does not bode well for the long term. It reeks of male privilege and the madonna/whore false dichotomy. You don't have to let potential future in-laws know all your past escapades, after all, just be square within your developing relationship.

Just forward her texts to me.

LW needs to propose to each woman and then set the wedding at the same time and day at churches two blocks apart, with a platonic girl-buddy from work being the only one in on the secret, so she can cover for him.

Then the LW needs to be "called away" for a work emergency right before the honeymoons, so he can send each wife ahead to the same resort while he catches a later flight to join them.

@5 - you're not old fashioned; you're nosy. The only thing a prospective partner is required to disclose are things which will affect your future lives together. That would include STIs, kinks and desires you still have and expect to have going forward. The rest is none of your business. You should be using condoms until you've had a sufficient period of time to be able to trust that a negative test will pick up any infections.