Ok, some possible scenarios:
People: You agree to meet up with a friend for dinner in two weeks. He/she tells you a few days later that it has to be postponed because something at work has come up. You understand because it's work. But it happens again (the friend needs to have dinner at the in-laws) and again (the friend has to buy XXX or do XXX) and again. After a while, you think to yourself, perhaps your expectations were too high in the first place.
Event: You plan a holiday. You plan how to travel, where to go, what to do. However, you learn when you arrive that the bus service doesn't exist anymore. That restaurant has closed. This activity can only be done in another month. You are disappointed and try really hard to go with the flow, but you can't help but think that perhaps it's easier if you didn't have any expectations in the first place.
I'm just wondering if this is a type thing and I just need to learn what @Faceless Beauty has said. Or am I actually valid in having certain expectations? It's come to a point when i just think, maybe I should just not expect anything from anyone/anything anymore.