Hello, I'd like to help you with your question.
From the behavior you describe, it sounds like he might have a personality disorder, possibly narcissism. Anyone who can manipulate a therapist, present his own reality to make others believe him and play games in a relationship is usually narcissistic.
Personality disorders are typically ingrained behaviors that someone develops, usually in response to being raised in a dysfunctional home. The person could not get their needs met (for unconditional love and attention) so they developed other ways to get what they needed which usually involved dysfunctional behaviors. When they become an adult, they continue these behaviors even when they were no longer needed.
Treating someone with a personality disorder can be difficult. For one, they have to recognize they have a problem and be willing to get help. Also, personality disorders are hard to treat because they are ingrained in the personality of the person. So treating them is altering the person's perceptions and some basic personality traits. That does not mean they cannot be treated, but the effort it takes on the part of the person is more intense.
Therapy can help your partner if he is willing but at this point, it sounds like he does not see he has a problem. And if he is willing to manipulate the therapist he did
see and to try to convince you that you are the one with the problems, then it is very unlikely that he has insight into his own issues. And there is no way to make him realize that he needs help. You can tell him and encourage him, but he has to be willing to see his own issues.
How you approach this depends on whether or not you want to continue this relationship. If he does have a personality disorder, the likelihood that he would change is very small, even with help. So you may want to talk to a therapist on your own about your options.
In the meanwhile, you can learn more about personality disorders to see if they fit your partner's behavior and to learn more about how to help yourself:
Letting go and moving on from this type of relationship can be difficult. For one, you have invested time and energy into making it work. And two, even though they often hurt you, people with narcissism can also be charming, attractive and seem like the love of your life. So letting go and moving on is hard. However, if you can, try listing all the things that have gone wrong in the relationship, including any cruel things he has said or done. Also, talk to a therapist. The support can help you work through any grief you experience.
I hope this has helped you,