I think sometimes we put sponsors on a pedestal, especially new in recovery. When they make a mistake or we feel as they we've been let down it's easy to get resentful.
A sponsor's job is just to take you through the steps ... period. A consequence of taking you through the steps is that a relationship gets formed, but a sponsor shouldn't be viewed as a therapist, nor be available at the drop of a hat.
I always think that's it's good to get a small circle of AA'ers to be close to, people with good sobriety. That way as and when the sponsor is not available there are others to turn to.