Play Time is Over!

Some of you may recall that Alvin used to have a near nightly ritual of playing an odd game with me where he would kind of mouth my hand.  It was very cute!  I wrote about an incident that occurred about three months ago when Alvin accidentally clamped down on my finger quite hard, which caused me to pull away and yell.  At the time Alvin responded by looking very concerned and dejected.  It was so pitiful and I tried to reassure him but he seemed quite concerned.  Since that time he has never played his little teething game again.  I have tried and tried to entice him into playing again but he just won't do it.  Isn't that sad?  I miss it very much because he always looked like a puppy when he did it and it was the only thing he did that resembled playing.  He also did a little lunging thing, which was about as aggressive as he could ever muster.  The boy can't remember to go outside to go to the bathroom half the time but he remembers one time, three months ago when I yelped at him.....ugh!  The guilt!