Yes, and that is like being an self absorbed idiot.
If you tell your friend you are going to his house on X day, he most certainly will make his plans based on that, will avoid other things he could have done, and everything. If something better shows up for you, and you say to him that you will not go anymore, you will screw his day, because you care only about yourself.
Seriously i HATE this kind of person.
If you say something to someone, damn DO IT! If this will cause you disconfort, that is your problem to say it in the first place.
Raiding, going out with friends, job, everything that you make a "deal" with someone needs to be respected.
If you will miss, you need a GOOD excuse, for sure.