am I in the wrong for getting upset when someone cancel plans?

I’ve been casually seeing someone, so it’s not anything to take seriously when plans get cancelled. But after a few times of having it done to me, I will let that person know how I feel about it. For context:

They hit me up in the morning asking if I was doing anything for today and I thought it was an invitation to hang out. I asked them what they’d like to do and what time they’ll be free and they answered “idk what do you wanna do?” and “probably tonight”

I can already guess here that they don’t seem like they want to hang out but since they asked, I answered along the lines of getting something to drink but most places might be closed by then.

They followed up with ” we should do that, what time” so here my thoughts are oh ok they do have free time to hang and told them the time and place.

Meeting time is about to come, I’m all dressed up, but I usually leave an hour earlier since I take the train and sent them a text of what time I’ll get there by. I get a text back, “something came up”. And when I told how I felt and how they should’ve let me known sooner, they apologized but they seemed more upset about me for sticking to plans.

I dont know maybe I’m just super sensitive about this because I had a similar situation earlier this year when I was dating another person too so now I feel like maybe I’m the problem. I dont hang out with people that often, so I’m just idk maybe lacking social cues?? I have screenshots of the texts if anyone like to get better context, just dm me. I really need second thoughts.