Re: I love you, but am I in love with you any longer?????
I, too, wonder if the husband has made advances to the daughter. He seems to have no boundaries, so it seems a possibility. And kids don't often tell, especially when they have to live with the perpetrator, with no guarantee Mom will leave him if it comes out. This could be the source of their issues. I'd be especially worried if any of the p 0 r n uncovered related to child/teen p 0 r n or even the "schoolgirl" type (grown women dressing as such) that is so popular.
In the meantime, he's so proud of his little man? I doubt he makes the child feel that way, but I'll bet he shows enough favortism to make your daughter feel absolutely worthless. I'm sure she's intelligent and supportive, but she really shouldn't be carrying this burden as a child - the object of abuse by Mom's husband while having to be Mom's confidante regarding the same jerk! It leaves her feeling she has to sacrifice herself for Mom's happiness; it should be the other way around.
I also wondered WHEN he suddenly changed; could it have been shortly after your marriage, or any point in which he felt comfortable having "gotten" you so there was no need for the seductive facade anymore? He felt he could be himself?
I think you may not realize that this - having a family, but refusing to be a part of it except to partake in sex or criticism while attempting to seduce others - is actually a form of mental cruelty/abuse. Sure, it's not the worst , but it accomplishes the same objective: it makes you feel unloved, unloveable and keeps you in your place.