The jury should disregard both of the nannies' testimony for the reason that of course they would be "happy" because Rusty didn't have any idea of the affiar!! So Rusty had no reason to be unhappy...he didn't know of the reality of the situation. And Andrea is obviously a good actress and didn't show him her dissatisfaction with the marriage....or perhaps she even enjoyed having two lovers...that is if she still had sex with Rusty, who knows...we don't know the details of their relationship. But whatever it was, obviously Andrea didn't change her behavior towards him, so why would he act differently?? In fact...he and Andrea's relationship had maybe gotten better in sexual terms...not to get too graphic, but maybe Andrea was turned on by her secret affair and being "bad," and this translated to being "naughty" at home, too, if you know what I mean.