I'm a bit behind, but I think it's great news that he called, and also great that he invited you to band night. In relation to the mower, I wouldn't read anything into it- he may assume that he wouldn't be able to move back in with you immediately given the length of the S so far, or he may want to have a bit of time to himself to think about things etc etc. Also the none of his business comment could be a fishing comment- don't read anything into it for now.
I think band night could be very illuminating! Can't wait to hear how it goes.
