I'm bad about holding grudges too, but seriously. Why do you even want to be in contact with this person? If you want to hold a grudge and not like this person, why do you want them to apologize? You might be "willing" to end it, but you are probably just as "willing" to not end it. If it really bothers her, then she will tell you to knock it off (or eventually break down and kick you in the balls). If you want to end it, then just end it. She obviously doesn't care about you, and an apology will be a hollow "sorry dude" sort of thing.