You can bet she deleted everything--
I don't think it so much the fantasy about cheating, as much as she knew the character had a wife, and needed her out the way to get what she wanted from him.
Janeway's personal log on Fair Haven:
"I met an interesting man there, and for a while I almost forgot he was a hologram. We weren't exactly compatible, but then again, Mister Paris didn't programme him to my specifications. "
This is interesting, because there was obviously something about his roughness that attracted her to him.
But even more telling, she nearly forgot he was a hologram, he was so realistic to her.
Which suggests she had to have taken his marriage seriously--she fell for him anyway, and technically speaking, got rid of the wife.
I know this sounds silly, but the issue still remains, would the wife have liked what she did with her husband?