LADIES, how would you feel if your man went to Vegas without you??

So backstory... hes been best friends with this girl since he was 5. She lives in LA we live in Baltimore. I am 5 months prego and she invites him to come out for "one last fun night before baby number two comes". I was not and am not invited. We havent even been on a vacation yet. It's only a weekend but I cant help feeling hurt by this? Am I being ridiculous or would you feel the same?? He said he wants to go alone so he can drink and go to the casino without worrying about me being pregnant.