I Am Depressed Because I'm Lonely

One of many reasons why Im depressed. I found a girl who liked me after years of bullying. I did everything to make her happy. Phone calls, compliments etc. Then she just left. She wasnt even going to tell me. Now how can I get over a 8 month relationship like that? When noone has even liked me before. Its sad its been about 52 days. Now Im lonely again. I dont have any friends and thats the sad,embarrasing truth that I try to hide. Shes all I had good in my life when it comes to people. She said she hates me and doesnt care about me. Thats what most people say to me.No one cares about me. Why was she brought into my life?