When I confronted my WH about evidence and his behavior he told me their wasn't another women and he also said you will never forgive me. I will never forget that slip up.
If he said "you think I am still F*#K(*g her " then I think you have need to consider he did.
About her lying I have to say she will if she feels she needs to protect herself. When I talked to my WH's OW she told most of the time nothing happened. WH told me that wasn't true. I would believe the OW less.
To answer your question - I don't think you are reading too much into his words. He needs to realize this and stop being defensive about what he said.
Your WS needs to understand how to rebuild trust. Badgering and trying to make you feel you are being unreasonable is not going to help.
Me BW - 46
Him WH - 53
Together 23 yrs, Married 18
DDay August 2011
2 kids - 13 and 15
Gotta love the life that we livin'