How do I even reply?

Me and my boyfriend go into an argument. And I decided to break up with him. I decided that I deserved better and that with the way our relationship was going, we were not gonna work out in the future. The last text I sent was "I deserve better than this and you know that" and he said "you're right go ahead and find someone better" and I said "one day" then he replied a simple "goodbye". I haven't talked to him since and I don't even know if I should.