One of the hardest things to do is lend a shoulder to someone, while you are in the middle of leaning on everyone else's shoulders! (Dumping boyfriend and changing jobs qualify, IMO.)

Can you set a time limit for the call? Have him get to the point, explain the problem, let him know you want to think about it and not give an off the cuff response?

Do you have any idea what the issue could be? Then you could be prepared to say you will get back ot him in a week; but without knowing th eissue, a week may not work. Just an idea.