Unless you are in therapy with a psychiatrist or psychologist trained in dream analysis there is virtually no way to decipher a dream.
They are abstract and symbolic and rarely mean exactly what you see. You could see someone slip on a banana peel and you laugh. You might go home and dream about a tiny yellow car with a bunch of clowns slipping and sliding and falling all over each other as they exit.
Just off the top of my head, I'd say that when someone close to us dies and it is too emotional and hard our brain goes into protection mode to keep us from going into melt down.
It gives us some information to process and come to terms with before giving us more.
I'd say a cheating husband is easier to accept because there is always hope that she'll leave him or he'll come to his senses and come home and cheating is a forgiveable offense. There is no hope for death, she doesn't give him back and forgiveness doesn't bring him back.
It's a sorry sad club you've joined and I wish you were not a member. I can offer that the first year is the hardest because every darn holiday will be the first without him. The anniversary date will be difficult. Some years it wont be a big deal but some years will be more of a problem. Knowing that and expecting it makes it easier to get through. I'd recommend a few sessions with a therapist and joining a grief support group. You can learn what others do and that can help.
You do what you must to take care of yourself. People told me to go see funny movies. It was worse. Nothing was funny. So i started to go to sad movies and it gave me a reason to bawl my brains out with the rest of the audience. The first time I watched TV and laughed out loud was a big deal.
My best wishes for a happier future.