When Will I Learn

So, here I go again with the, "when will I learn" crap.  But seriously, when?  Last evening met two friends for dinner.  Was happy (well, not really) drinking tea and then came the urge to have a glass of wine.  Maybe only one glass, right?  I know me better than that, yet I ordered one glass and drank this slowly.  It tasted good, so I had another.  Dinner was over and I drove home.  On the way home, I thought, "what the hell, I might as well have some more cuz I have already blown it."  So, I did.  Today's weight -217.2.  Ok, so I did lose back what I had gained, but still.  What the hell?