I fell i love with someone online. I need to move on. help?

I seriously felt strongly for him but he didnt love me. I felt like he just played with me. He didnt take me seriously but at first I thought he was serious with me because of the way he acted. I am extremely hurt. This is the first time I have fallen in love with someone. I was looking forward to being with him and spending the rest of my life with him. My heart is so crushed. Please help me. I dont know what to do. I guess he's a player? :S He lied to me and all I was was some girl to him. I was only extremely sincere and true to him. I was his friend first. Id die for him seriously, that's how much ive fallen for him. I was happy being his friend even without getting love from him in return but he didnt respect me. Im just so sad. :( I walked away when he lied. I had nothing to hold on to anymore. He wasnt the person I first met. Im just so crushed.