Boys brains?????

Ok I seriously don't understand how the male brain functions. So I went to visit my sister at her college for the weekend and my boyfriend was supposed to come but my sister told him he can't last minute because there wouldn't be enough space. I felt really bad that he couldn't go and if it were up to me he would have been there with me. So now I'm here and he knew that my sister was throwing a party and we would be going to a frat afterwards. He told me that he was really worried about me going to the frat and told me not to get drunk. I wasn't planning on getting drunk so I thought it was ok. Anyways I am getting ready for my sisters party and I start to not feel well and end up telling my sister that I will just stay home and not go to the frat. I tell my boyfriend that I'm not going and he doesn't have to worry and he says "tbh I think you should go for the experience of it" All those times, he said that I shouldn't go if I don't want to and now all of a sudden, I should???? Huh?? He starts sending one word texts and I knew something was wrong. So I asked if he was ok and he said he was. Then I said cool and then he never texted me back for the rest of the night. He also left me opened on snap which we don't ever really do so I knew something was up. After everyone left my sisters party and went to the frat, I stayed behind to clean up and stuff. I decided to text him to ask if he was mad at me and why he wasn't talking . He ended up replying that he just doesn't want to talk. So I asked if I could know the reason why he didn't want to talk and he said "bc I didn't" so I just left him on read for the rest of the night. I did not feel like arguing so now I'm just waiting until he wants to talk. It just sucks that since he is not telling me what's wrong, I automatically assume that I did something wrong and now I can't stop overthinking. I know for a fact that I did nothing wrong but somehow I am still worried that I did. He sent a snap of his ceiling to me so I sent one back and he left it on read sooooo i really don't know what to do at this point. Sorry for such a long rant, I just need help