promises!

If it becomes a habit then I would consider them liars but I would also be carefull not to jump to conclusion

I will see whether is there a good reason for the promise. If yes, then I'll accept it. However, if that person keeps giving me empty promises, I'll not believe him/her promises again.

Yes, people should not make promises unless they know they absolutly can do it. The only time I would say no is if something unexpected happens that they can't control. Like a family emergency. But other than that if they promise to do something then they need to do it. Work/friends/etc should not get in the way of keeping their promise to you.

I wouldnt call him a liar, naturally yiou would have to take in consideration why he couldnt keep his promise.Example , if this friend said he was going to go roller-blading with you but he didnt go because he broke his foot, or something else came up that is excusable.....I would give him a chance to make it up. If the promise is more serious, I would expect an appology and explanation.....and next time be cautious.

depends on the reason why they didn't do the're promise...