Unecesarry fight in his eyes🙄🤷🏼‍♀️👀

My boyfriend moved in with his friends about 3 months ago and i am not the biggest fan of them and he knows this, but that’s not the point or what this argument was over. Anyways my boyfriend and I tend to hang out on Sundays because he works Saturdays. I thought we were planning to drink Sunday because we both enjoy it at times just going to the beach and relaxing, we talked about it and it sounded like a plan. Well today he calls me on his break and seems the only reason was to change the plans because he asks me what we’re doing Sunday. And I’m like uh idk I thought we were drinking and he’s like yeah well I’m actually going to drink tonight at the house so I don’t really feel like it tomorrow. And I obviously got pissed off because this isn’t the first time this has happened and he drinks with them on his days off or when he doesn’t have to work the next day, which is like two days out of each week. The last time we drunk Sunday he had drank the night before and just wasn’t feeling it. He thinks that I’m angry over not drinking this weekend but I’m just upset that he’s always doing things with his friends and that pretty much limits what we can do if you know what I mean. If he wants to drink with them tonight cool, but regardless it shouldn’t change our plans. I just feel like this happens so often and he just doesn’t understand. All he says is that he doesn’t mean it in a bad way so I shouldn’t get mad. Never tries to understand where I’m coming from or what I’m trying to say🙄