just need advice

Hey, so I’m younger than my friends and recently they all went off to uni, but because I’m younger I couldn’t, both my boyfriend and best friend and the rest of my Friendship group left about 2/3 weeks ago to go to uni! - obviously I knew that this was going to happen because they’re all older, but I didn’t realise how empty it would have made me feel! - I am not over protective and I’m not clingy nor am I controlling, but if my boyfriend is going out i think it’s only fair for him to say what he’s up to or if he’s going with a few girls just say I’m going with a few guys/ girls ( he has a lot of girl friends and I’m absolutely fine with that)!! But last night he went out and said he was just going to meet some friends and go for a few drinks and then come back to his apartment, so I was like yeah cool okay have a great night! - but instead he went clubbing! I may be over reacting and pls tell me if I am, but it came across as really suspicious, like why couldn’t you tell me you went clubbing? I don’t know his friends and what their like or what he’s like out clubbing and things and that’s fine, but to not even tell me he went out clubbing has really left me feeling insecure, there are many other reasons I’m feeling crap about this situation, one huge reason being because I’m really not very confident within myself so I feel like he will fancy every girl! ( which is silly; I know) but ah girls can you just talk to me, just need some hard advice