I lost my first wife when she was 45 after nearly 23 years of marriage. For me what helped a lot was staying distracted. Encourage him to get involved with activities outside of the house. Also just continuing support and communication. The first week or two after the death everyone wants to be helpful, brings food, etc. than it just pretty much stops. I also had friends go through all my wife's clothing and take them to donation centers, it would have been hard on me to do that. Also understand that you can be adjusting well then a song, a smell, a sight, a place triggers a memory and you fall back apart for a bit. Much healing can take place in about six months, but nearly eleven years later I can still tear up expectedly at times. Hope this helps some.
GuzziJohn