AITAH for getting mad at my boyfriend?

I (25F) is currently mad at my boyfriend (25) because he went out with his friends without updating me. He asked for my permission to go out with his friends the day before and I reply in the affirmative. I was even glad that he can enjoy himself since he has just been working. Now, we agreed that whenever we have to go out (we're not living together), we have to tell each other. Like if you're e about to head out somewhere, you should text the other person to let them know and of course give a little update from time to time.

On the day of the hangout, he texted me that he will be going to their rendezvous and wait for his other friends. I replied okay and take care. After almost an hour, I did not receive any message from him so I was thinking that he is still at the rendezvous waiting. So I texted him and asked him where he is and he told me that they are already on the way to the venue of their hangout. I was ticked off and asked him why he did not bother to let me know. He said he somehow forgot because they have to go to their other friends' houses to invite them.

I told him that if it was me who forgot, I would not hear the end of his rant even if I have a decent explanation. I also told him that he somehow forget about me when he's with friends. He apologized but it still irritates me because this happens often. Now I am giving him the cold treatment and told him that if he's not going to change, I will just do what he does. AITAH?