I might have a conversation with him to find out what is going on. Maybe give the benefit of the doubt. We all like to think that if something did happen (death in the family, emergency, etc...) that he would at least let you know (that is how I would do it) but not all people are alike.

IF however, after that conversation, I figure out that he is just lazy, giving me the run around, and so on, I would make my decision. If he is the only one doing the job you need, or comes highly recommended, you might bite the bullet, if not, you may take it down the road.