Waiting for that response

My boyfriend and I had a fight and it's all my fault. I sent him a breakup message that I regretted later on and when I apologized, he didn't respond to me. After a few days he told he doesn't want to do it anymore and I've hurt him. He also said some hurtful things.

We haven't spoken in 3 days and when I reached out to him, he was civil and responded positively to my messages. I then told him I'm sorry for what I did and ask to give our relationship a second chance. That I've made some changes to make our relationship better.I tried my best not to be emotional for fear he might run away. He then said he'll try to reply later. Which he didn't and now I can't sleep because of it. Should I send him another message to remind him? Because I'm not sure if it's the right thing to do.