Will I be able to let go of the past, and not hate him so much?

My ex joined a fraternity and dumped me on my birthday, and left me for another girl, the girl I always accused him of cheating on me with. Its been 3 years he keeps calling and texting me after all this time.He is still with her, I think he wants to brag about his life.He and i haven't been on speaking terms. He works at ESPN, and I just graduated out of school and work at Sally Beauty Supply. I feel like a real loser, b/c he is doing much better than I am. I have a really good boyfriend now, I am looking for a career but ikeep failing, this is the best I can do 4 right now, how do I feel better