Families of Prisoners Support Group
This community is dedicated to families that have been disrupted by prison. Having a loved one incarcerated or having been incarcerated comes with its own unique challenges that require support and understanding. Join the group to find others who know what you're going through, and to seek advice or share your experience.
I'm not sure if I can help give you any insight with your issue but I think I'd start by making him a bit of a priority if you want to build back a relationship with someone you've been estranged with.
Buy a bunch of different postcards and stamps. If you don't have an hour to sit and write a long letter, send him one of those with a funny note every once in a while. It takes a few minutes and let's him know you were on his mind.
I believe that our inmates understand that we have busy lives but it means the world to them if someone takes a few minutes out of their day to let them know they're not forgotten.