It's not that Carl doesn't care about you, it's that Carl shields himself from having to experience that deep hurt of betrayal his Father inflicted upon him. I'll bet Carl could use a good friend who cares despite Carl's inability to risk developing a deeper relationship.

My Father was USAF. Then a Pilot for a major airline in the 70's. He committed suicide when I was 9 years old. Thankfully, I learned to let people in, or else I may have ended up like Carl.

Sorry to hear about your struggles with anger. I know how hard it can be. I was angry at my Dad and the world for a few decades.

Best to you.