We begin with Rebecca talking to her female friends about how over love she is, a conversation that quickly segs into a song and dance about her plan to adopt a buttload of cats, the classic identifier of single women everywhere.
Later, he leaves after Greg and Nathaniel show up on her patio and Josh - hearing the commotion - runs outside in nothing but underwear to try and scare away possible feral cats.
He correctly guessed that because of this, Rebecca moved up her wedding date to Josh Chan.