I hope you're wrong, but you're probably right. But I bet if I really don't want to forget it, maybe I won't. But realistically, you're right....I guess.
You can remember her, of course. But it wouldn't mean much if, 20 years from now, you have a wife and children. Just forgive and learn. Love, move on. Its hard sometimes, yes, but often its the best thing. Learn from the past, but live in the present. And, if ever it comes up, you can still be her friend. It may be difficult, but hey, who knows?
And remember what Shakespeare said. "Tis better to have loved and lost, then never to have loved at all."