Relationships

Am I wrong or is my boyfriend being unreasonable?

Me and my boyfriend of 1 year got into an argument last night. In March it’s his sisters wedding and I am invited to it, and going over there very early in the morning to help set things up and help out. It’s my best friends bday the day before the wedding so I did say to him that I was going to meet up with her to give her presents and spend the evening with her and go out for a meal. He told me that I should be back early like 9pm because we have to get up early the next day. Which I said was fine and I understood why. A couple weeks pass and my friend lets me know that on her bday she would like to go to her fav restaurant that is an hour away from our home for her bday dinner. I said yes to this and didn’t think anything of it and was going to suggest to go out to at an earlier time so I can be home by 9.
Anyway as a passing comment I said to my boyfriend that that’s what the plan was on that and he got so angry and started shouting at me why would I say yes to that and not care about his sisters wedding. Saying that because it was an hour away that there is a likely chance that I will be home later than 9 and then be tired for the wedding the next day. Wouldn’t listen to what I had to say and kept saying I was wrong for doing so? The conversation ended as him saying that if I go to this place the night before the wedding then I can’t come to the wedding and I would not be his girlfriend after. He said I can still go for a meal but he wants me to tell my friend that I can’t do the place she wanted to and if she really want to go there then I cannot come. I just think my friends will think it’s a bit weird now if I said that after already saying yes, and I don’t really want to get my boyfriend in trouble with them.
Am I in the wrong about this? Or is he overreacting I really don’t know

Am I wrong or is my boyfriend being unreasonable?
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