The abandoned note simply read:
Dear Hermione,
I was extremely sorry to hear the unpleasant news of your impending marriage to a Mr. Severus Snape.
But I know you don't care about my opinion. I know you fancy yourself in love with the vile man. I can't see what you see in him, but you see something, and after this note I will never say a word about my feelings about Snape.
You're my friend, and you'll always be my friend. But I won't support you in this marriage.
Come to the woods behind the Weasley's. It'll be our last night as the single trio.
Harry