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