Perhaps I should reword. Why does OP care/give this any mental or emotional bandwidth? Why are these two communicating?
This woman is demonstrating lack of character & making herself look bad at the very least, certainly being disrespectful of the husband (who would be hurt or angry or both).
Now. If OP can suspend his character/value judgements just to get laid? Perhaps he could get laid....but if anything this girl is planting seeds looking potentially to monkey branch or fool around outside the marriage, and with their previous history it would get messy quickly.
The woman will be unlikely to leave her husband without another lily pad to leap to, that will entail far more drama than its worth and OP seems to be "Meh" about her from a sexual standpoint.
So OP is wise to digest her stance as a compliment from a woman without too much character, be flattered, feel some sympathy for the poor guy who wifed her up and move on.
Why is he in touch with a married chick? She's not available, and he does not have enough social acumen or "game" to make this work. She is not the test case to figure it out with either.
Paging
@The Duke and
@Scaramouche for further perspective.....
Cheers lads.