Bf’s parents

my bf is awful at keeping plans. He believes that I shouldn’t expect him to always keep our plans because it’s not an “appointment” and I should just be grateful when I do get to see him. On the other hand I am a planner, I want everything planned out perfectly because of my anxiety. it’s been causing us lots of problems because I will get upset with him when he cancels plans (mostly because it happens like twice a week). Recently we got in a really bad argument about it, and he texted me later saying his parents talked to him about it and said I am manipulative and that I can’t change and that we should break up. That if I can’t change they will talk to my parents themselves and tell them we can’t be together.

So I told my bf I would work hard to not get upset anymore when he cancels plans. We’ve been together for almost 2 years and I can see myself marrying him one day. I don’t want to lose him over one stupid issue so I just decided to give in. But I asked him if we could find a balance where he tries better at planning things and I try not to get upset so much and he REFUSED. And warned me again that if I don’t change we will be forced to break up. I don’t know what to do.