Allison's thoughts 

What do I do now Leland is here and I can already tell that Spike doesn't like him oh my god Spike I forgot to go to his crypt.

At Spike's crypt

Allison: Hey Spike sorry I'm a little late I totally forgot about coming here.

Then Allison turns around

Allison: What the hell is this?

Allison sees Spike and Buffy in bed together naked.
Buffy gets out of the bed and pulls a sheet over to cover her naked body.

Buffy: Allison this is not what it looks like
Allison: Really because it looks like you were having sex with my boyfriend and yes I said, boyfriend.
Spike: Look love she was having some trouble that's all

Spike got up and put his pants on

Buffy: Yeah I was just having some trouble and I needed some advice then there was Spike.
Allison: So this is how you ask for advice by having sex with men you know what never mind I'll just be leaving.
Buffy: Allison, please
Allison: Just leave me alone both of you

Then Allison left. She is now just walking until she heard her name being called by Xander.

Xander: Allison!!

Xander runs up to Allison

Allison: Hey Xander
Xander: Are you ok?
Allison: Not really are you ok?
Xander: No
Allison: What's wrong with you
Xander: Me and this girl Cordelia we were dating until we broke up what about you I bet yours is not bad as mine.
Allison: I saw Spike and Buffy having sex
Xander: Ok you win

Then Allison laugh

Xander: You laughed you never laugh
Allison: Yeah I know
Xander: Why?
Allison: I just don't anymore I guess that I didn't have anyone to make me laugh anymore.
Xander: Well now you have me
Allison: True
Xander: Hey you want to go to the bronze
Allison: Um sure why not
Xander: Awesome let's go then