could it have been enough anger at his parents and family...to make a move 600 miles away...then his dad having a heart attack?
Yes it is something that happened in his childhood, maybe teens or preteens that he has an issue with his parents. His father having a heart attack could trigger that he will never be able to resolve these issues. Understand you have become the role of the parent and he doesn't like his parents, so he takes out his anger on YOU (the surrogate parent)
