So he lies to his wife about having women on the side, and he lies to those women about being married. On top of that, LW tried the counseling route previously. At this point, a decent divorce lawyer for LW and STI testing for everyone seem like the best options. This marriage is done.

I've been blindsided by the discovery that I was the "other woman" before, and I don't recommend the experience to anyone. I'm glad that LW doesn't seem to be blaming these women for the husband's horrible behavior.