Trying to have a better relationship with our adult son who MIGHT be autistic.

We have a 42 year old son ( an only child). He is very intelligent and knowledgeable, and kind and often affectionate. But difficult to reach emotionally,. Prone to get upset if we ask him about anything to do with his personal life. He has hobbies and is in work (with computers...no surprise there). We see him  every few weeks and speak on the phone but we miss the somewhat  closer connection we had with him when he was a child. He is more adept socially than he was. Has never had a diagnosis of autism - but is dyslexic. I think he has some friends, a few anyway.

There are others with a diagnosis of autism in the wider family.

We feel sad not to be able to connect better.

Any suggestions?