Originally Posted by
nodaybut2day 
b) Abusers *rarely* change. Right now, he's in a honeymoon phase with his new flavour of the month. Soon enough, she'll become his new plaything/victim.
This, exactly.
If he had been himself right when you first started dating, it wouldn't have gotten any further.
That same trick he used to hook you, he is now using on someone else.
She is not "better" than you, she is "newer" than you.