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[While Dawn is holding onto Buffy trying not to fall apart, Buffy is reeling from the news that her little sister and Xander were dating, and apparently in love. It doesn't show on the outside though. She runs her hands up and down Dawn's back comfortingly]
He loves you, Dawnie. He just hasn't gotten to that yet. Xander has always loved you. Give him a little time to...absorb and get there.
[She's not sure how she feels about Xander dating her sister, but she knows exactly how she feels about Dawn crying, and it's not good.]