When it comes to telling you that your m was a mistake, never loved you etc, it really is script stuff, I heard it too, generally they can't recall saying it and certainly they don't mean it - how could they have lived a miserable existence for so many years and not do anything about it or no one else see it. Its total MLC tosh, so please don't take it to heart.
As for his new found "love" - an avoidance tactic, he doesn't want to deal with what is going on internally, she is a distraction, it wont last, how can it. A relationship built on lies; he is trying to be someone he isn't and that will catch up with him. I know its hard, but try not to give her any head space, she is not worth your emotions, she has got herself involved with a guy in crisis, you have this information, she doesn't, she will find out soon enough.
