@Joe Nation,
He sent her to have a shower, promising something.. Telling her he'd kick her friend out as soon as she was out... Maybe he promised her chocolate pudding? Not sure..
Then he couldn't get the visuals out of his head, although they nearly caused a plumbing problem... So, he decided that her best friend was a better memory which really sucks because, she does big time. To do that to her friend.. And, so she should now be the OP's biggest EX... Followed by her ex... Without any S's about it.