Is OTHER wrong in the post ? POST : Background info: this person has consistently agreed to plans, the time passes, and he’s made other plans/cancels without letting me know as if he assumes I’m just aware of everything going on in his life.

So my friend told me we should do stuff today during the week. I agreed and we said we go get smoothies before 3 pm today so we could catch our other friend on their shift. So today around 11 I told him are we still on for today, he said yes, and I said “ok just let me know when.” Now it is really cold out right now, and our original plan was to bike their, but I figured if it came to it I’d just drive us. 

So now it’s half past three, I check snapchat stories and he’s out with his girlfriend. I take this as, “alright he probably wants to go later and we will just miss our friends shift. At this point, I’m getting kinda pissed, so I ask him he we are going or not. He says it’s too cold out, which it is, but I’m still pissed he didn’t think to tell me beforehand. So I call him out on this habit, and he says I did the same thing yesterday. (Yesterday he invited me out to watch a game with some other people but I said I’ll pass because of the game was outside and it’s cold out.) I tell him the difference is that I cancel beforehand and that was it. AITA?