Would you...

[someonelse]

If someone (a friend) said some really really really nasty things and then came back a year later and wanted to apologize...would you accept it?

[anachronistic]

Eventually.

[Mish]

it would depend on what was said and why

[DoesntMatter]

You're gonna need a lot more details to get peoples responses

[boobaa]

Why do you ask? You are in this situation and don't know if to accept it or not? isn't it obvious that you don't want to accept because you are questioning it?
Would accepting because of our beliefs be a genuine accept? -I personally don't think so. It is either you understand that person and therefore have sort of accepted -just haven't confessed it to yourself because of pride. Or simply you haven't accepted the apologize (feel some anger towards that person) but don't want to go ugly and need to be 'polite', which in my mind is a form of tartuffism.

So, basically the only real advice I feel right to give is about how to understand the apologizer better. My opinion is that if after so many years he/she comes to apologize, it really must have eaten him/her inside. It can be wether there is regret or the insult in the first place wasn't even meant (it just somehow happened). The regret is more probable IMHO.

[Lipp]

As said, more details are needed for a proper response, but I'd probably accept it with a significant degree in skepticism, just trying to acknowledge it but not be as open and be a bit cautious.

[misombra]

i would accept.

but it doesn't mean i'd want to go back to having the same relationship.