That's understandable.
Hopefully, when he saw you again after a year, it's possible he had admitted to himself how wrong he was to be seeing both girls at once, and how it must have affected those closest to him. Incliding you, a concerned friend, who could have said or done more about it, but for all you know he might just not listen/ get defensive/ say "mind your own business". So, maybe he was letting you know that he doesn't hold anything against you in regards to his own dating errors.
And if I'm right about this, he's better than those who never learn, including the genetic misfit females whom I fell for back in my... "less squeamish" years.
Take care,
