My boyfriend doesn’t want me to go out with my friends

I’m 21 and my boyfriend is 25. I started socially drinking when I was 19 and he has been doing it since he was about 15. He is now tired of it and doesn’t really see the fun in it anymore. I, however, love to go out with my friends and drink, sit at home and have a girls night with wine or go to a bar. Now i’m going to an 18+ concert with my friends and we will be drinking. My boyfriend doesn’t like that at all. He has no problem with me sitting at home and drinking with my friends, his only problem is when I do it outside. Whenever I go to out to drink he becomes super anxious and suspicious of everything I do. He calls me and constantly checks in on me. I always feel super stressed because if I don’t answer fast enough he will actually think that i’m cheating. Once i texted him instead of sending him a picture on snapchat and he accused me of cheating on him. He gets like that every time I go out for drinks. It has become exhausting to having to always talk to him and always explain myself when I would never do anything like that. He never goes out for drinks with friends and always sits at home when I leave, which gives him nothing to do than to always be watching me. I want to be able to have fun with my friends without him feeling anxious, but I don’t know what to do.