Trust issues

So my boyfriend has been hanging out with a few girls he knows I don't get along with. Even though I don't mind him hanging out with them, I don't trust these girls . I've also told him to let me know when he hangs out with them because I personally don't like to hear what my boyfriend is doing from other people but this time, I had to hear it from someone else and told me they were drinking and "partying". When I asked him if he was with the at any point today, he denied it. I don't know if it's just me being jealous but I have the URGE to punch him without talking... I need some advice. Please help!