my FIL who is 81 lost his wife of 61 years to ALS. Almost immediately after her death he decided she had been cheating on him. He's become extremely angry and hard to reason with. Burning all of her belongings and removing her photos..has emptied the house out completely almost.
I know my Dad [94] was very upset that my Mom [98] had passed as she could have still been here if she wasn't so stubborn and would have welcomed caregivers into their house to house to help.
I remember a few days after Mom had passed, Dad asked me to remove all her clothing from the house, which I did. Dad was finally able to move to Independent Living, which I believe he wanted to do years earlier but I guess my Mom refused to move.... the house was just too much for him to maintain and Mom was still having him climbing ladders in his 90's. He misses my Mom a lot, but doesn't miss that house.
Apparently anything reminding him of her is being destroyed to wipe out the memories that are triggered by her possessions.
This is really sad, and I think a bit extreme, but I'm obviously not aware of the scope of reactions when one partner dies.
If he's religious, I would ask the paster/minister/priest/rabbi to counsel him. If not, are there any others in the family, or close friends (especially someone who's also lost a partner) who could spend some time with him?
Funeral homes sometimes have grief counseling. You might check with the home that handled her funeral to see if they do.
Hospitals and I believe nursing homes also sometimes have grief support groups.
I'm sorry your father is reacting so extremely; this must be very hard on him to accept that she's gone. Perhaps you could offer to help him clean out her things, if there are any left, and just take them home with you or put them in a storage unit if there are things you want to save.
Another aspect that bothers me is if he comes back to reality and realizes what he's done, that he's destroyed evidence of her existence, that he'll become overwhelmingly depressed and despondent. You might want to prepare for that.
If you know of a psychologist, it wouldn't hurt to have a consult, probably more helpful for as you are open to advice whereas your father probably isn't.
My Dad is still going down that path, convinced that if their new primary doctor had seen my Mom, she would still be with us today. I just cannot convince my Dad that it was a series of falls, with serious complications from head trauma that took Mom, and that no doctor would have been able to correct.
My mother died at age 37. Dad was angry with her for leaving him with 4 girls. About every 3 months he would fly in to a rage directed at us.
He was still angry when he died, 38 years later.