What's the protocol on my being dumped by your best friend/FWB?

A couple of months ago, my best friend started pursuing me and we began what seemed to be a great relationship. Though a lot of it was based on physicality, we really did have a good time together. He was always pushing a relationship. He said he loved me and several days later, I told him I was ready to be in a steady relationship and he rejected me, but told me he "wasn't ready, but it was an when NOT an if". Five days later he tells me we should just be friends. I'm dealing with the break-up, but I really want to go back to the best friends that we were before all this. He hasn't emailed, called, texted, or made ANY sort of contact since. It's been a week since we've talked. When can I text and just say, "What's Up?".