Nonetheless, make sure that you do it when you had promise or agree to anyone on any particular issues.

I simply dislike people who would just like to open "empty cheque". A total downgrade to your character and the depreciation of trust and reliability in you.

Disappointment, why?

Is it so diffucult to make an extra effort when I had done so?

Bits and pieces of mixed feelings and actions express how much are you willing to do so for a person. Stop these actions before any worse case senario are coming into place.

Because, everyone has its limit of patience.