I cannot promise you that
I will not change
I cannot promise you that
I will not have many different moods
I cannot promise you that
I will not hurt your feelings sometimes
I cannot promise you that
I will not be erratic
I cannot promise you that
I will always be strong
I cannot promise you that
my faults will not show
 
But...

I do promise you that
I will always be supportive of you
I do promise you that
I will share all my thoughts
and feelings with you
I do promise you that
I will give you freedom to be yourself
I do promise you that
I will understand everything that you do
I do promise you that
I will be completely honest with you
I do promise you that
I will laugh and cry with you
I do promise you that
I will help you achieve all your goals
 
But...
 
most of all
I do promise you that
I will always love you