Slowly,
I must say its the first I've heard of continual contact by OW's H. How did he get your number? Might be time to change all your phone numbers. A pain I know, but might help with keeping the ties broken.

Also, have considered give OW's H a copy of DR? It might be a good investment. It could lead him to understanding why he shouldn't be calling you about her whereabouts.

'til later,
KAW