My condolences on the loss of your relationship. Your ex sounds like he needs considerable therapy, and I am sure years down the road any lies and other things will come back to bite him mentally.
We all attract certain types of people, and not everyone evolves, and in fact as we all age quite a few people devolve. How? Well unless a person works on their issues as life happens and sticks with the status quo, entropy will happen. Too bad entropy will happen between the ears, and the rest as we all know goes down hill.
Good luck and remember in therapy if he continues to go and you are there, some discussion on the importance of boundaries :)