The only problem I have with this theory of maligning his name with computer porn is ... how would it do that?
Guys sometimes look at porn. Even good guys. I personally cannot understand why but hey, to each his own, and if a man is living a decent life I am not seeing porn as a red flag.
Child porn, however, is a whole different animal.
And women. Lots of women. 1 in 3 people watching porn right now, is a lady. I think if her goal was to malign his name, she would have from the start been like, "He didn't do anything to me! He had this porn fetish, he watched it on his laptop all the time.. but he never did anything to me that would make me kill him.". She wouldn't have let months/years gone by without trying to get that information out.