Dude better tell her to just sign the divorce papers and fuck off. She cheated on him and blamed him for her transgression. That means she doesn't give a damn for him...
Sounds more like Mantis girl killed her own family while under the thrall of some kind of bloodthirsty curse...Spider girl manipulated her memories so she wouldn't remember doing so.
Hmm...with her ability to fuck with minds and mental states...I'm starting to think our monster waifu is more a Lovecraftian eldritch creature than a Japanese youkai...
Hmm...just noticed. Does she like being naked in her true form as an adult? She had no problem being clothed in her earlier life while in her true form...
Science dictates that matter can't be created or destroyed(only transferred or transmuted, like into energy or something)...so her smaller human form would have to be denser than a normal human. If that's what the author going for here...