I used to get so hurt by people. I would expect them to do something, and when they didn't do what I thought they should do, I felt let down and frustrated. I got to the point that I was angry almost every day because of peoples actions or lack thereof.
But God began showing me that my expectation was in the wrong place. Rather than looking to people, I needed to look to Him. He is my source, my strength, and my expectation. When we understand that and put our expectation in God rather than people, then we can actually enjoy people more.
We won't put as much pressure on them and there will be more freedom in our relationships. No one else is responsible for your joy. As long as you are putting that expectation on them, you are going to be unhappy, and the relationship is going to be strained. Only God can give you true peace, joy and contentment.