During a "feast cycle" in my consulting practice, a former client called me for advice and ideas during his job search. Not just any client, but someone who had been an anchor client in my practice: a HUGE client.

In the midst of the battle, I said I wouldn't be able to help him at the moment. That was a big mistake. I believe his feelings were hurt, with good reason, and it ruined our future relationship. This was one attempt to mend fences. Even if the relationship doesn't rebound, as it didn't in this case, apologizing is still the right thing to do.