Hi, Des....
I too have had a stalker. I dismissed it as harmless, though eventually I did seek the help of the local police. This fella wasn't even phased by that, and had told me things like '"You'll never get away from me!" He had assured me he wasn't violent, but he ended up breaking into my house with a gun and trying to shoot me. The gun jammed and that is the reason I'm alive today. Bottom line here is: you can't take this lightly. If he is ignoring your polite requests to stop contacting you, he is probably capable of anything. He has already threatened to tell your husband. I can see what a predicament you are in regarding telling your good husband, but what if this man calls him or shows up on your doorstep!? I think maybe the advice here is right: to call the police and also tell your husband what is going on!
Be safe!
Patty