The reason I did not leave for fifty years is that there would be no one left to care for the man, and I couldn't put that responsibility on my oldest son. I couldn't put him out with the trash. The doctors believed his lies. It is difficult to keep a person with OCD on their meds.
He could change if he wants to, with medical help. It is his choice, not yours at this point. If you leave, he could become homeless or in the streets, as I saw that happen with a neighbor. I stayed with the same feelings I would have if I were helping a neighbor, as a volunteer for helping society a little. I quit loving him as a husband because my husband was gone. He died because he would not cooperate with the doctors about his diabetes, his alcoholism, and his cancer. It was his choice. Dorisena

Do you not have any physchiatrists in your area? His problems sound like too much for a GP or physchologist to handle.