We were each other’s one and only. But now what to do?

I really need advice!
My ex and i have been in a relationship for over 2 years. We were perfect together, each other’s first loves, first kisses, first dates and everything. But i always argued with him, didn’t appreciate what he had done for me and whenever we argue i felt he’s getting farther from me. And around May, he initiated a breakup but i said i would change and we worked out things. But in July, i also got emotional and started argument and we didn’t talk to each other for 9 days and after that he suddenly cleared his nickname from FB messenger and deleted the pictures from FB and changed his password. I begged him again and again. But he said very hurting words to me and kept saying no. And I agreed with him and he said if he misses me he’ll come back to me no matter when it is. But I went to his home after a couple of days and begged again. He was really angry at first but after talking a bit he was just like when we were dating, he was smiling and hugged me tightly. And I begged to have sex (we didn’t do it before) but he refused and he said you would cry and regret it. But he agreed anyways. And after doing that i begged again but he still said no. So that night, which was July 17th i wrote to him saying i will wait for you, but now i’m agreeing to breakup. He said i was still his first love and the most beautiful girl in the world, and if he misses me he will come back. And after a few days, we met up to get some documents from him, and he was different, he was no longer angry but was smiling and kind to me. He said he won’t look for other girls and although he knew i was logging into his icloud account, he won’t change his password and he still didn’t change it. And i asked him to kiss and he kindly refused, he said no we can’t. But we kissed. He said he was in a hurry, but i begged him to stay a bit but his mum called and get angry with him and asked where he is. After that he got annoyed. We almost didn’t talk or chat with each other. But he kept seeing my instagram story while not seeing his friends’ (i knew his password and he didn’t) he even seeing his chat with me on messenger. But suddenly he stopped seeing my story but saw his friends’. He also searched for some famous girls’ instagram. And a few days ago i felt bad because i was the only one who knew his password and changed it back to his old password. In a minute he changed the password to something i don’t know and deleted all pictures with me that he didn’t delete before. I don’t know whether he got angry because i kept changing his password. I sent him a chat saying i’m changing for good and thanked him for breaking up with me because if he didn’t, i couldn’t have changed my behaviour and giving my a chance to start everything freshly and i also said i’m waiting for you not to get back together but to start everything from zero, when we got shy because of each other. He has seen the message but didn’t reply. And a couple of days ago, he deleted all the photos of us from his phone, but started viewing my stories again.
What should I do from now on? Do i still have a chance to get him back? I’m planning to write to him in around second week of September with some messaging saying our old happy memories. Please give me some advice. Thank you!