AITAH for celebrating my grade with another guy instead of my boyfriend?

I (16F) have a boyfriend (17M), he's like super duper smart, school president, advanced classes, all of that. I, on the other hand, am not the sharpest tool in the shed (and he knows it). My average is barely passing😅 Anyways I've been studying really hard lately since I have minister exams soon and they're really important for my next school year.

A few weeks ago, I got a 74 on my science test for the first time ever! I have always gotten around 65 on my science tests so I was super hyped. I went to go find my boyfriend and tell him. He congratulated me but didn't seem as excited. I asked him why he's not hyped and he said that even tho he's happy for me, I shouldn't be celebrating a 70. I was a bit sad but I still understood, he gets 90s all the time so a 70 isn't that good for him.

Fast forward a few weeks, I have another science exam and I get a 78 (so close to 80!), I went to go find my boyfriend again and tell him, I hoped he would be more enthusiastic since it's closer to 80 but he had the same reaction. I was disappointed and walked away. In my next class, one of my classmates (who is also in my science class) said he saw my grade and congratulated me on it (unfortunately it's pretty known that I get low grades). Anyways, the guy was pretty happy and he was hyping me up. I don't really talk to that guy but it felt good to have someone be happy for me.

I haven't just been studying more in science but in history and math too since my minister exams are on those 3 subjects, math is still a work in progress😓, but I recently got an 81 on my history exam! That's like a giant improvement for me and I was super hyped so again, went to go find my boyfriend thinking maybe this time he'd be happy since it was an 80.

...he was not. He said congrats again but said he wouldn't celebrate my grade until I got a 95 or more🥲. I was once again disappointed but whatever, 95 is his standard. But then the other guy found me after school and congratulated me, again, super excited and happy for me, gave me a high five and everything. I felt good about myself

Few weeks later I get 86(!!!) on another history exam but instead of going to my boyfriend, I went to the other guy. I don't even know why, I guess I was just so excited and I wanted someone to be excited with me. I went up to him and he was super hyped with me, we were in the hallways and my boyfriend saw us.

After school my boyfriend came to me and asked me what was that abt, I told him and he got mad I went to another guy to celebrate my grade. I tried defending myself by saying he's never happy for me. We got into an argument and we haven't talked in like a week. I miss him but I don't know what to do. I don't think I'm in the wrong but I have no one to ask (my fam doesn't know abt my relationship and my friends would def be biased).

Pls help!!!