I wouldn't really worry about it.... he might expect it was an accident or he might not want to return the call, you never know. I went through a pretty rough break-up myself about a week ago and I'm in the same boat as you. sometimes, though, as much as you want it to work out, it just won't. all you can do is let things play out and see how it goes.
As for your last question, It is possible to "call" someone, and realize before it connects and hang up. they may have never gotten the "missed call" alert.
