its finally over!!

Its official over, i even changed my phone number. But i keep going back in forth with my emotions. Im so angry at him at the same time i feel relieved. When i feel angry i ask myself why, why did it end up this way. When im relieved I think to myself finally i can do whatever I want for once. I feel like messaging him and asking him why did he do what he did? But if i keep starting the conversation his gonna think it's okay to message me. We promised to stay friends after we broke. Is that good idea or no?