..What am I doing wrong..

I've been home from my vacation, in which I left Ronnie with some family friends for the week, for only 2 days. They say he was perfectly well behaved, I think she may have even used the word angel once. But he's driving my up the wall! I've come to the conclusion that my problem is one of two scenarios...

1. He is a completely different child when I am gone. In which case, what have I done to make him want to be so "difficult" when I'm around?

OR

2. The problem is simply me. I'm obviously not meeting his needs somehow, he's acting out, and I'm totally clueless as to what I need to do different.

I'm leaning towards the latter. I figure it's time to take responsibility for the situation, after all, am I the mother. So the question remains.

What am I doing wrong?