*(I am not a psychologist, I have experience with this situation and I am sharing from that and my own research.
Often, if a couple is in therapy, the narcissist can put on such a great show that their partner ends up looking like they are the problem, and the therapist, if not knowledgeable about narcissism, will not see the real issue.
Therapists can be manipulated to further abuse the victim, “proving” the narcissists accusations of their partner not doing enough and reinforcing the thought that the victim needs to do more.
Narcissistic men, in particular love to use intense sex as a means of hooking their targets, and they tend to have lots of it.
Once he knows he has you hooked, either you have moved in together, married, or by some other means, his behavior will change. The charming man you fell in love with, the one who who worshiped you, will fade away, or worse, you will wake up one day and he will have become an entirely different person.
Any boundaries you have set up are merely challenges to a narcissist. He will take it as a personal victory when he ends up “changing your mind” in just a few days. He will bug and cajole you until you set up a date.
Anytime you say no, they will find a way to change your mind, and do it in such a way you think it was actually your idea.
He will gladly listen to your entire life story, so that he can learn how to exploit your points of weakness and so that you will see him as a comfort and — again — trust him.
Honestly, he sees it not so much as listening or communicating, but as gathering facts he can use against you later, and as building up your trust in him.
In reality, he is just no longer wearing the mask and is showing his true self to you.