Is this a problem of high expectations, or fake people?

In friendship, whenever I have trouble, it’s usually due to the fact that I feel that the other person isn’t valuing or taking part in the relationship as much as I do. Is this my high expectations of them? Is it my fault for demanding too much? Or this a case of friends being friends just for the sake of it? Not really knowing the value of true friendship?
This isn’t just a one off case, but I have felt this on numerous occasions and it’s begginning to eat me on the inside, every day =/