I need advice!!


So for the past 3 weeks I’ve been talking to this guy....let’s call him Alex. Me and Alex aren’t dating or anything just talking (the stage before you date) and last night he kept asking me to go to this party but my friends couldn’t end up going and I didn’t want to go to a random party alone. So I didn’t go, but later on snapchat I saw a girl twerking and grinding all over him. I could kind of understand if everyone was dancing and she just kinda started dancing on him but it was only them two dancing....... he was holding onto her while she was holding onto a counter and everyone was just crowded around in a circle. I don’t know if I should be mad, or even have the right to be mad bc we’re nothing official. But if I do have the right to be mad, what should I say to him?!