I'll share some thing with you, weather or not it does you any good I have no idea, but maybe you'll take some thing from it.
When I was a kid my folks split up, my older brother took it badly & over time he went off the rails, becoming a drug addict & violent bully, he made my life a living hell, and it only stopped when I became to big to handle & turned on him.
From that point on there was bad blood between us, when ever our paths crossed it was allways tense & fractious, at times we we're like 2 dogs circling each other spoiling for a fight.
Well time passed until summer 2001 when years of drug addiction caught up with him, & he OD'd once too often and wound up in a coma, which he wasn't expected to recover from. My dad made the decision to turn off my brothers life support as his body was failing, he asked my to be there at the end but my response was "#### him he's had his chance".
Here I am, 14 years later, and if I could take that decision back I would in a heart beat, it wouldn't of mattered a damn to my brother if I was there, he never regained consciousness, but with the passage of time, ive come to realise how much it would've mattered to me, things needed to be said that remain unsaid, I will regret that decision to my dying day, it weighs heavily on my shoulders & allways will.