It is on your timetable because right now you are OK with giving him more time. If you weren't OK with it, I doubt you would be doing it. You understand that unless he has the space and time to want to come back, then he will never truly understand what he wants for himself. And, for him to figure that out is worth the wait to you. But, I don't get the sense that you ever think of yourself as sitting around waiting forever or even twiddling your thumbs for a couple of years.
BTW, I think I misunderstood something you wrote at the end. I take it that what you really mean is that you asked if you could call SO back because it was a bad time for you but then you wound up staying on the phone with him for another 10 minutes, yes? I bet you were frustrated that you did that.
I bet you were frustrated that you did that. 
