He doesn't sound like much more than a "fair weather friend" or at least one that uses you for convenience for sure. Considering he's mentioned you doing stuff with him before and dropped the ball I see that there seems to be a pattern forming. I'd be careful about letting him continue to call on you for these convenience calls. Don't be a doormat. Sounds like you're a nice person that would do a lot for a friend. Just don't let people abuse your niceness

Hope this helps