Am I overreacting?

I am currently facing a difficult choice in whether I am overreacting should I break up with my boyfriend (M15). I (trans M 15) am facing the awful choice whether I should break up with my boyfriend. The reasons for this is 1. He didn’t remember my grandfather was in the hospital, the reason i believe this is because he said “oh I hope you have a lot of fun with your grandpa” how am i supposed to have fun in the ICU?? 2. My grandfather did end up passing away and all he said was “oh damn I’m here for you” and when I said i would rather not go into detail he said okay and never said anything about it again, two days later my dear bird chub chub (terrible name I know) passed away. He said “what😭” when I said and I quote “chub chub passed away” then he made sure to say he was crying at least six times when I was trying to talk about it, mind you in the six months we’ve been together he has looked at them for two minutes. And also he said “I actually needed to cry, I haven’t cried in 2 months…” and made it about him. Like yes I would’ve loved to process that when I wasn’t trying to get comforted at 9pm because my bird died. This isn’t as bad but he has texted many times pouts when he says he misses me. He also calls my best friend that I introduced to him without telling me at all, my friend told me to join the call on discord and he silent for five minutes before he says “(deadname) I didn’t know you joined!” Lovely. He calls me his husband as a joke like I do with my close friends,but he also says that with one of my friend that they are also his husband, and it made them very uncomfortable. And I had to tell him. He also calls me a nickname that only my family calls me that I told him “hey that’s my deadname! And only my family calls me that” he also calls me my deadname a lot. He also said that I told him only one month ago that I went by they/them. When I told him four months ago I go by he/him with the exception of they occasionally. Should I break up with him? And am I an asshole for this?