Buffy and Angel
4th - "Surprise"
ANGEL: In all those years, no one ever mattered. Not like she did. And now she's gone. Forever.
BUFFY: It's so weird... every time something like this happens, my first instinct is still to run to Angel. He's completely different from the guy I knew.
WILLOW: Well, sort of, except...
BUFFY: Except what?
WILLOW: You're still the only thing he thinks about.