The thing that jumped out at me is her bringing up his NPD & that being reason for not getting treated for ADD/OCD. She sees him as sick, & maybe using that as his reason for doing what he does. There must be a redeeming quality in there?Right? Maybe money, or the really big ring. That sounds so shallow.
It is a service announcement though, sort of saying anyone he is with is a temporary ego boost that will be tossed out when he's done.
Sounds like a guy without his head screwed on to me. And she wants no one to see him so he will settle down.
Maybe she can stay, even with the randy behavior ...