Losing out

I'm a little ticked.  Was having a good convo with a seller and was afforded the opportunity to respond/commit to buy by the end of the day.  I did.  Lo and behold.  Sold to another.  Wasn't given a courtesy heads up that an offer had come in even though I was within the time frame noted.   Am I wrong to be irritated?  I don't operate that way.  Even with people I don't know I do the right thing.  Don't believe the right thing was done today by a highly graded seller.