Dear Minaji
Like Ramesh Ji has rightly said, it is truly our expectations from others as simple as a Thanks, Smile , Including us in their lives as we do to them are all causes to let us down.I have not read the Gita or ay of our Hindu leterature, but as it is said there, Krishna said do what you can and do not expect results.
If you feel happy that you did the just thing, even for a moment,that supercedes any other feeling that may follow. Baba is watching everything, somehow surrendering ourselves to him (as it may seem to come as an excuse even to many of our shortcomings) let's him take care of us completely.
So just hang in there and think of Baba.
Deepa