How should I handle this breakup situation?

[USA]

My ex boyfriend and I broke up six months ago (he broke up with me). We were best friends for a long time and dated for 3 yrs. We're both 19 years old. I know he did love me and I loved him. We were a happy and healthy relationship. Early in the summer, he broke up with me and told me to live my life. He was influenced by this decision because he had read my blog that said how I was unhappy and I wasn't the same person and so on. The reason why I had put this was because I was nervous about the future and I was scared about going to college. It was a huge fear for me. He said he was breaking up with me because he had no feelings. Although, something in my heart tells me that wasn't the truth. I feel like he did it because he was scared of the future. I still love him with all my heart and I always pray to god that he'll come back. I sometimes see his tweets and he'll be out partying but then he'll have really sad tweets like "i miss you and i love you when will this feeling end." or "there's nothing left for me in this town anymore..." I've always thought that when you really love someone you fight for them, but then I've heard if you love someone let them go, if they come back then it's meant to be. I've been recently tempted to contact him just to clarify where we went wrong. I still love him deeply and I'd do anything for him. What should I do ..should I fight for him and try to talk to him or should I just keep moving on with life? Thank you so much for the help.