The context of the following conversation is Riley fancied Casey so invited Casey over so Casey came and had dinner at Riley's house.:
Riley says Guess who came over for dinner the other night..
The friend responds Well, it wasn't me, I know that. Why wasn't I invited?.
Riley responds Because I wouldn't want someone to interfere with my private time with Casey..
The friend responds Casey? Really? Casey had dinner at your place?.
Riley responds She sure did. I finally worked up the nerve to ask. We had a lovely meal..
The friend responds Good job, dude! I knew you had a crush on her, but I didn't expect this!.