Why does a guy talk bad on the girl he's cheating with. on his wife?

My husband cheated on me with one woman at his work, but when i asked questions about the friendly relationship, he says how gross she is etc... why?

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To add to what I wrote, I have 2 children with this person who actually adore him. This incident happened 10 years ago over a 10 month period, I had just had my 2nd child. I almost died during child birth! After the birth, the next 10 months of my life was he'll how my husband treated me and he cheated on me. Part of him cutting the girl down he cheated on me with, he was coming home with scratches on his back 4 fingers worth on 1 side and 4 fingers worth on the other side. Women's hair etc.
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I wasn't even healed yet fro my emergency c section and blood transfusion. 😪 why do spouses act like this. This all took place 10 years ago, during a 10 month period. And we still fight about it...
Why does a guy talk bad on the girl he's cheating with. on his wife?
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