Google grey rock it’s a great response. You just minimise any emotional interaction. I found that he came out of it once I had shown that I was getting depressed about it I.e he had control over my emotions…. I now know that this was the worst thing to do as it just reinforced his view that he could control me. If I’d known about grey rock before I would have done that. His behaviour is not your fault, you have done nothing to cause it, it is his choice as he wants to be in control. Don’t give him the satisfaction of thinking he has made you unhappy or anxious/depressed.