He’s “crushing” on some other girl?!

I’ve known my fiancé for a handful of years and we’ve been engaged for two and a half. I recently saw a post, that I wasn’t supposed to see, where my fiancé said he was “crushing on [his] boss” I confronted him about it and basically said that to me a crush is like someone you want to be with/date/fuck and he said he just meant it like she was hot. My question is do you think he wants to do something with her, and would you leave someone for saying that that had a crush on their boss?