WSID?

Hello everyone! I 23f am looking for an advice, Please be kind.❤️

I am writing this literally shaking, So… My boyfriend went to his brother’s 21st birthday celebration on Saturday (saw a lot of girls on one of the pictures he posted) it was a party I get it, we didn’t talk much because I was also busy with my assignments (He went offline for way too long)! After that things been a bit cold between us, idk why, he blamed me on my period! We’ve always had our pictures on our wallpapers, he comes to see me today and Lo and behold, I am removed from his wallpaper, I ask him about it, he goes pale, then he says something like “no it automatically changes from time to time” Am I overreacting? I just left him standing there, I didn’t know how to act, what should I do?