Unit to measure love friendship & trust

Unit to measure love friendship & trust

Once A Girl Askd Her Bf :

Why We Have Units To Measure
Weight, Height & Distance
But
Not Love, Friendship & Trust?
.
Boy Thought For A While
.
.
.
Took Her In His Arms,
Looked Deep In Her Eyes & Said
Look, DON'T Eat My Brain!
I Have Already Failed In Physics :p:D