Is there any hope for my situation?

Hi, I’m 22 and my ex is 18. We had a two-month-and-a-half relationship. He broke up with me a month ago. My ex has a best friend, Hoang. His girl friend is Thuy. We often hang out together. My ex told me that Hoang felt overwhelmed in the relationship, sometimes his girlfriend (Thuy) controled him too much. My ex told me not to let Thuy know about this, but then I unintentionally told Thuy. She got angry with Hoang, but then they reconciled very soon. But my ex got mad with me and he wanted to break up because he can’t trust me anymore, he feels that we have distance. I didn’t beg or plead, after the break up I just texted him that I miss him, once. The last time we talked was two weeks ago. He is a rapper, and some of his crazy fans attacked me online, using insulting words. Then he texted me, told me not to worry, don’t be sad, he will solve that for me. That was the last time we talked. Now he has a new girlfriend, they just date for a week but I hear that they move in together. She is 22 years old, like me. Now I don’t know what to do. I don’t reach out for him because I don’t know what to say. I still keep his certificate (he is a winner of a rap battle). He used to tell me if I could send it back to him, but at that time I was traveling so I told that I would contact him later. Now I don’t know if i should contact him or not. And is there any hope to get him back, because he is with another girl now. Should I do something or should I give up and move on? If I try, so what should I do? Sorry for my bad english. And thank you very much. Wait to hear some advices soon.

“My ex told me not to let Thuy know about this, but then I unintentionally told Thuy”. It sounds ridiculous to say you unintentionally told Thuy! You broke his trust and he won’t forget it.

Send back his certificate. Your “relationship” was only 2 1/2 months and too much troubles occurred. I think you should move on and leave him and his new girlfriend alone. Sorry, but it’s the best thing to do under the circumstances.