Maybe I just care about some the things

Yesterday I got back from my friend's house. We had a good time, but there something unfortunate happened an unhappy thing. A boy, who he is a good friend of mine, he had also made a appointment wanted to meet up with me yesterday. He said he wanted to have a breakfast with me and then once I got back home. At first, I was so happy ,because I hadn't seen him for a long time since the college entrance examination, so I was missing him. Yet in the end he broke his promise, even though I had waited for him for a long time. He did not turn up at all. I am sad, and my girlfriend said that maybe I just care about the things too much. I said maybe I do. Today he did not get in touch with me. I am so disappointed. Maybe my girlfriend is right.

I'm sorry to hear that your friend stood you up.

For your writing, you do need to learn some grammar rules such as past perfect and past continuous. You really need these when you tell a story.  Your story was about a personal experience, so formal phrases such as "an appointment" look awkward. 

Also, pay attention to punctuation. You made many mistakes, and that made your story difficult to read.

Unfortunately, the other member corrected you poorly, ignored many errors, and even added mistakes. Be aware of this, and ask questions if you are not sure.

Maybe just I care the things

Yesterday i was back from my friend's home. We had a good time ,but there happended an unhappy thing.A boy ,he is my good friend ,yesterday he made a appointment with me .He said he wanted to have a breakfast with me and then i was back home.At first ,i was so happy ,because i have not seen him along time after the college entrance examination,so i miss him.But at last he broke the promise, and I waited for him along time .He did not occur finally.I am sad ,and my girlfriend said maybe just I care the things.I said maybe.Today he did not contact with me ,I am so disappointed.Maybe my girlfriend is right.