No, it's not your fault at all. He is responsible for his own actions. He cheated, he lied. It is all on him. When it comes down to character flaws like this, you have to look at it all square in the face and say to yourself that you are fine just as you are and that it's all HIM. Anyone who lies and cheats has major character flaws.

I am so very sorry that you were so misled. I know the feeling of realizing it was all a lie and something far different than you thought it was.

It will take time, but please do keep reaffirming to yourself that there is nothing you could have done differently.

I am glad you have blocked him.

(((((Hugs))))))