Is a break in a relationship good?

My boyfriend of almost eighteen months told me four days ago that he thinks that we need a months break from our relationship. Prior to this, we’d had an argument which, I admit, was my fault. When I asked him if he loved me he said he doesn’t at the moment but he might do in a months time. Ever since I have been phoning, texting and emailing him non-stop. I’m worried that in a month he won’t want me back, that he’ll find someone else. I’m worried that he’ll just forget about me and find someone else. How likely is it that he’ll want me back?