LOLS, sorry for your loss.
It sounds as if he did not discuss his plans or request your views before proceeding. A spouse deciding to become a practicing JW, typically will not take into consideration the impact that decision will have on other members of the family even when the remaining family has no intention of becoming JWs themselves.
Things you may normally take for granted such as Christmas and Birthday observances will often become heated issues. If you or one of your children should be injured and require a blood transfusion, will he honor or consider your wishes or will he oppose a transfusion regardless?
You said:
which we all know they are not allowed to get divorced ...
This is not fully correct. Some JWs couples do become divorced.
Even when there is a legal divorce, if there is no infidelity by either party, then the JW is not free to be in a relationship with anyone else as he/she continues to be considered as married 'scripturally'. JWs consider the only valid reason to dissolve a marriage in God's eyes, is unfaithfulness.
If a divorced JW wishes to remain in favor with the organization but wants to pursue a relationship with someone else, they may attempt to gather evidence to a sexual relationship by their ex-spouse or request an admission to that in writing from their ex. Without a 'scriptural' divorce, the JW maybe disfellowshipped if they remarry.