(this is in no specific order)

1. "You think we're dancing?"-Buffy
"That's all we've ever done."-Spike (5x7 Fool For Love)
^^ They could never kill each other!

2. "How long was I gone?"-Buffy
"Hundred forty-seven days yesterday. Uh ... hundred forty-eight today. 'Cept today doesn't count, does it?"-Spike (6x3 Afterlife)
^^ He counted the number of days she was gone

3. They made 火災, 火 (7x22 Chosen)

4. "What's wrong?"-Spike
"I don't want to talk about it."-Buffy
"Is there something I can do?"-Spike (5x7 Fool For Love)
^^ Spike is always there for Buffy

5. "You've got another demon fighter now."-Spike
"That's...