What should I do?

I started dating this guy in April after meeting him a month before. everything was great. we were both crazy for each other. But we had an argument but this was resolved and we moved on. Then a few weeks ago we had another and I promised him that I wouldn't act clingy and he gave me a second chance. But a few days ago we had an argument because I sent him a lot of messages as he was busy and I was not aware that he was still busy and so I constantly messaged him and called him. The reason I was messaging him is because I was extremely upset and received some bad news and I really wanted to speak to him to see if he could cheer me up. This caused him to get angry, and he broke up with me, but I didn't mean to make him angry. I am crazy about this guy and I really want to make it work with him and I will do anything to get him back. He has agreed to let me go see him at the beginning of next month, and I was wondering if I should talk to him about this then even though it is 3 weeks away. I know that I am not that much of a clingy person I was just going though a bad time and wanted to talk to him. I would do anything for a third chance with him as I know that I can make our relationship work. I don't want to move on and forget him. I want him. We are still talking but not as much, and I just want to let him know that I want another chance.

What should I tell him when I go to see him? and what can I do to prove to him I deserve another chance...