Welcome to SR Xiz. Sorry to hear that you went on a binge, but congratulations on having a month sober, that's a great accomplishment.
As to "why" you did it, my guess is because you are an alcoholic like the rest of us here. And there really is no logical reason "why" we are that way...we just are. Were you working any kind of sobriety plan ( meetings, therapy, rehab, self-help, etc. ) during your month of sobriety? If not have you considered it?