Paul: How did it go with Liz?
Stephen: It was a complete disaster, she probably thinks I'm a loser now
Stephen: Dunno, I just couldn't bring myself to ask her out in the end
Paul: No way!! Why? She totally likes you, man
Stephen: I'm not so sure, she's nice to everyone, isn't she?
Paul: I mean yeah, but... trust me on this, I just know it. You've gotta go on a date while she's still interested! Come on.
Stephen didn't ask Liz out because he thinks she doesn't like him so much. Paul thinks she does. 