I had a quarrel with my boyfriend, and he didn't talk and didn't return my messages. Should I break up with him by the end of the week or just blacken him?

I think you should seriously consider it. If he doesn't reply to your message and he doesn't talk all the time, ask him when you meet him together, and then ask him if he still wants to be together. If he still doesn't talk, it means he doesn't want to be with you. Just break up, just say it. If he talks, it means there is still room for redemption, so don't consider breaking up again.