It is depressing how many threads like this I've seen recently.
For avoidance of doubt, it is totally fine to go on a girls weekend when you have a boyfriend. It's also totally okay to go out for drinks with the girls, dinner, or to a football match. And, wait for it because this one might blow your boyfriend's mind, it's also totally okay to go out with MEN who aren't your boyfriend because they are your friends or colleagues.
Do not let him convince you that this is a problem. Also, depending on how long you have been together, take a long hard look at any compromises you have ALREADY made. A few classic ones are:
fewer/no nights out with girlfriends. And if you DO go out, you make a point of being home early/ not drinking too much/ definitely no spontaneous partying.
Wearing differnt clothes becaause he doesn't like it if you're wearing anything revealing or sexy.
Letting him drop you off/pick you up (becuase he "worries" and "wants you to be safe") with the knock on effect that you can't be spontaneous
Turning down invitations for post work drinks or other work-related socialising. x100 if you have male colleagues.
Reassuring him that you are not interested in that man over there ( a friend, a colleague, a random bloke passing in the street).
Possibly even letting him see your phone to reassure him you're not talking "inappropriately" with anyone.
Similarly, reduced social media and deletion/blocking of many accounts.