My ex messaged me a week ago after no contact for just over a month. He asked me if we could talk and I asked him "about what?" he said "everything". He then asked "do you hate me?" and I said "no" and he said "thanks". I then asked "is that it?" and he said "no, i'm just at work. We'll talk tomorrow". After that message I never heard from him for a week. Should I just leave him be, or should I message him? Why would he say he wants to talk, but then avoid it?