Dependability is tantamount to loyalty. You can’t have one without the other. You can’t be a loyal friend if you can’t be counted upon.
Personally, if I know I can’t depend on you. Or your words, I automatically tend towards reclusivity around you.
I’ll buy your excuses, genuine or not, till eventually they lose their value and aren’t sellable anymore.
And someone once said, be so dependable that when you do not show up, they’ll think you’re sick or something very grave has befallen you and send you flowers.
Dependability is everything as far as trust and loyalty is concerned.