Hundreds of years? Losing his soul reduced him to "a life no longer than a human's."
While I honestly don't think the life no longer then a human's is true, and am under the impression that he has fought the curse to the best of his abilities and survived longer - however long he might have lived does not make my point in any way moot. Give a man who has had a leg amputated for 20 years the best prothesys (I have probably spelled that wrong as well, do forgive) - chances are he will not start jogging the day after he gets it.
As for 'q' in equation, I thank you very much. Not being a native english speaker I reserve the right to three typos and two misspellings a year.
Whatever gives you that idea? Reading his second journal gives me the impression he is fundamentally incapable of seeing anything he did as wrong.
While reading his first in which he talks about missing nature's embrace and how painful the faint memories of belonging are you'd kinda get the impression he feels at least some measure of regret over his separation from his kin.
The way I see Jon's thought processes evolving from that point id deeply different from yours, and it does not exclude initial regret. I do not deny that Jon is selfish, in the way that children are selfish - they want things done their way, now.
What happens when a child gets punished for doing something wrong? Regret and anger at the same time, with equal strength. The anger does not prevail over the regret because children, although they might not understand how they erred, love their parents enough to give them the benefit of doubt. Jon does not love his elves as much, whatever feelings he has for them slowly decay and thus, given his condition, I would say regret has a pretty thin chance at prevailing over anger.
The tone he takes suggests, to me at least, that ever since his first bid for godhood he has never considered the possibility that he could be wrong.
To this I say an emphatic 'No.'
I do not remember your love, Ellesime. I have tried to. I have tried to recreate it, to spark it anew in my memory. But it is gone... a hollow, dead thing. I genuinely do not think these are the words of a man who has never considered that he was wrong. A man who never considered he was wrong would point out that she has wronged him by failing to comprehend his genius, and that he is above such petty emotions as love. Furthermore, if he genuinely had done no wrong, he would not regret the company of those he had wronged, nor felt his removal from their midst as punishment.
Ah what an opportunity for a drow rant, but I shall skip - this is drow way. They do not regret not being part of the elven community anymore, in fact they feel much better for it. They are in complete denial of their evil. Jon is not, in my opinion, but he does not see an alternative, and so he perseveres in the only action he feels he has left that ties him to his people. That is taking revenge.
Everyone ends up kissing the wrong person good night.