This girl is incredibly stupid. Here's a dude that forced her down on a couch, kissed her and gave her a hickey (making her boyfriend pissed), yet she goes on a date with the guy just to get her pendant back instead of telling her boyfriend about the situation. And she still thinks the dude's a nice guy?
And what about taking into consideration how her boyfriend would feel when he finds out that she went on a date with another guy? Nope, doesn't cross her mind. Shou, you deserve a medal for putting up with this girl's shenanigans.