You wouldn't blame your friend though, because I myself has made a lot of unfulfilled promise. People get overly excited and make silly promise and failed after making such promise. so in such case I see it as normal. but in some case it reduces a person personality because your words or promise may not be much valuable or respected by your friends.
I agree, we're like that. We make promises when the situation is in favor of us and when we wake up in the morning, we're knocked that we shouldn't have said that. One hi and hello would fix this bad feelings to our friends that we're very sorry that we should haven't said something to make you expect something in return and you won't be expecting any money anymore. But that friend that chose to avoid and get away with that friendship might be wise for him and a good riddance on your part too.