Is breaking up on voicemail that deplorable?

So I broke up with my boyfriend over a voicemail because he wouldn’t talk to me in order to avoid what I was going to tell him. After trying for two days to talk to him, with no success, I had to leave “the” message. I heard nothing back in reply. I would have preferred to do it in person, but is voicemailing it really that bad considering how unreasonable he was being about accepting the whole thing?

I am just feeling like an awful person. I don’t want to be one of “those” people. What else am I suppose to do in that situation? :(