Victor remembers the moment he and Logan started hating each other. He remembers exactly how it happened in bold detail. The problem is that he remembers it in bold detail in three or four different, mutually exclusive ways.
What Victor is sure of is that once upon a time they were friends.
They were friends right up until Victor pushed a little too far in some direction and suddenly Logan didn't like him any more. Knowing Logan it probably was about a woman. Or honor. Or both.
Whatever it was, Logan decided it was more important that his pal Vic.