We’ve been dating for around a month, she knows me and my friends and I know hers. We get along well enough and I’m occasionally going out and meeting people but only have two plates at the moment so I’m not trying to look desperate and she has been dating some other dude who I seriously doubt she has sex with based on his attitude and body language this guy probably has only ever had one girlfriend. Do I need to tell her as a man that I want to be exclusive or should I just wait for her to do it ?