I think it’s fairly common of decent people having high expectations of decent human behaviors.

I think that your frequent disappointment with people come from you building these people up in your mind before you really get to know them.

If in your mind they are these wonderful creatures but then they turn out to be jerks, it’s upsetting. But if you took your time to get to know them, you’d know they are jerks and it would not be a surprise to you.

Two things that help with not building people up before you really know them is taking things slow (both romantically and friendship wise) and engage your head ahead of your heart in the beginning before you really know them. Like we feel excited about someone and all feels great then they do crap and it’s upsetting. But if we did more thinking at the get go, is this even a person to expect much from, we’d either not go on with them or we sure wouldn’t be disappointed. Don’t build people up prematurely.

Now is it easy? No. But it will help with disappointments.

You should continue having high expectations but that means choosing high level people. You can’t have high expectations of low quality people who can’t deliver. You’ll be perpetually disappointed