I think there are general, moral / ethical expectations, that we have every right to hold. But I also think we can have deeper expectations, that may not always be well placed.

Like I expect my dentist to know how to look after my teeth, but not be able to give me a vision check.

Our expectations need to be tailored to the situation / person and for there to be limits. No-one being able to be everything for us and ultimately to accept as humans, we can all make mistakes and let people down from time to time.

I had huge expectations of my parents. I felt let down. I think as a child, I had the right to hold those expectations, but as an adult, have to accept they messed up us parents, as they didn't have the skills.

Actually read a quote yesterday:

Someone asked
Who hurt you?

I replied,
My own expectations.

So maybe it is about, being clear and reasonable with our expectations, but to be able to forgive (with boundaries) when they are not met.