I see it more as being about acceptance. If your wife dies, at some point, you will have to accept that your wife died and move on. This doesn't mean that you are cold or insensitive to it, it just means that you have accepted and processed this sorrow fully and are now ready to move on.

Stoicism for me is about practicing a sort of pre-acceptance of such things. To understand that everything bad that can happen eventually will happen (if you live long enough) and to accept it even before it has happened.