That's crazy talk.
If she lied, that makes her a liar. If she slept around, that makes her a whore. Lying does not make one a whore.
And besides, she thought he was dead. And when he came back, she had never loved him, and still didn't. He was a hardened soldier, and she was afraid he would kill her, as well as her child.
Even today, there are women who lie to their husbands when they fear being beaten or killed. Natural response, I think.
And since they did come to love each other, I am sad for Vorenus. He was so happy for a few episodes. And now, just like Pullo had to watch Vorenus be in love, Vorenus is without and Pullo gets his woman. Damned show.
Yes, looks like a role reversal for sure. But Pullo will never leave Vorenus. He will be there for him, whether Vorenus wants him there or not. It will be interesting to see how Vorenus reacts to Pullo killing junior's daddy.